Grand Design Momentum 399TH reviews

We are so unhappy with this rv. 4 years, 2 pin boxes, a new controller, brakes failed 3 times, brake wiring melted hydraulic system, and now broken down in Georgia with a broken leaf spring on a 2018 camper. Shame on you Grand Design! Show less

We bought this fall of 2018, we have owned three or four different RVs. This one being our first toy hauler but we love the floor plan love the amenities, granddesign has been great to work with warranty wise too. Love this trailer and it’s a good thing because will probably keep it for a long time. Show less

I am ashamed of this mistake in my life. Stay tuned to find out why....... 7/29/19 - We have not had a good experience. In fact, there are so many issues with our brand new 2019 Grand Design Momentum 399TH that I intend to continue updating this post as time goes on. Look closely at photos #1 & 2. When I went online to get an insurance quote, I tried to insure my total investment; the value at number 2 (photo #1), the "bottom line" ($98,230.27). The insurance website would not accept this value and a pop-up warning said it could not be insured for more than its retail value. I tried other values until I had to settle on the value at number 3 ($89,998). By this we know we paid full price. I assume the value at number 1 (photo #2), $118,254, is used to make the buyer think he/she is getting a discount. There were NO discounts for us! Only the Devil's deception! Throughout the sales process, my wife kept telling the dealer that the 'king' sized mattress was too big for the space provided, and that there was not enough space to get around the bed. See photos #3 & 4. The dealer refused to exchange the mattress. GET THIS! The dealer gave us a $25 gift certificate for use in their Parts/Accessories department. So why not buy the quintessential 'sewer hose'? After deduction of the $25 coupon, plus a veteran's discount ($10), I could have bought it on Amazon for a lower price and had it delivered to my house! See photos #5 & 6. What did the little birdie say? "Cheap, Cheap!" The shower door leaked, and no wonder! See photo #7. The sealant was just "gobbed" into two spots on each end of the track. Water found the path in the middle of the track and ran out onto the floor. We thought the water was seeping up through the floor boards. But since it is sheet flooring, this was not possible. It only 'looks' like floor boards. Photo #8. Electric fireplace crack - this is supposed to be a "luxury" RV. Why would I put up with a cheesy looking fireplace? Photo #9. Screws missing and hinges not fully seated in garage lavatory door. Look at the gap between the hinge and the door jam. We took the RV to the dealer on 7/29/19 for repair of several items. I hope this doesn't continue. We're going "full-time" because of my job. We can't afford the down time. UPDATE 8/29/19 - This is no longer a 'bad experience'. It has become an ordeal. We had hoped that the service department at the dealer could redeem themselves, as well as Grand Design RV. Not so. When I picked up the RV on 8/23, I didn't have time to look it over until I got it home. We discovered a number of things that were really just related to the dealer's service department. But there are plenty of issues to point a finger at the manufacturer. First of all, what is with the 'pissing contest' between dealer and manufacturer about what gets priority? The dealer recommended replacement of door and frame between the 'garage' and the living quarters. The indication on the service report is that Grand Design (mfr) 'suggested' (see photo #15) "...rebuilding frame adjusting door to fit". One day this past week, the door was stuck so badly that I couldn't open it! I had to go outside and come in through the back door! A 'suggestion' does not get me full and proper access to my RV. After being at the dealer's for a few weeks for repair of some of these 'issues', we found a number of items related to poor Show less

We purchased our Momentum in April of 2019. This is our third toy hauler (so that folks know we are not new to the RV game). Let's start with what is good about it. Just about everything. We did our research and looked for over 2 years b4 landing on the 399TH. What we did differently this time was made sure everything about the toy hauler worked for US. We ignored all the bells and whistles when walking through the campers we looked at and focused on whether or not this camper would accommodate our needs. The 399TH won. We also spent a great deal of time researching the manufacturer's reputation. Have we had problems with our 399TH? OF COURSE WE HAVE!! And don't be foolish enough to think you won't. There are some truths about the RV industry that we have learned the hard way. 1). No RV you buy will be defect free, GD included. Get with that up front. If you are not willing to agressively pursue the dealership you bought it from and the manufacturer, then unless you are mechanically inclined and can fix stuff yourself, think carefully about whether or not this is for you. 2). Make no mistake, as soon as you drive your pride and joy off the lot, the dealership is done with you. Here is where GD has excelled with us. We have had THE best warranty experience with them ever. But lets be clear here..while GD has been awesome and authorized all the warranty work, we CANNOT say good things about our repair experience with our dealership and GD cannot control that. I won't detail what was/is wrong with our Momentum but I will tell you this...none of it is major. Overall, we are very pleased with quality of our RV. 3). Quality is hit or miss in the RV industry. One of the things that drew us to GD was their "comprehensive final finish inspection". A rigorous 288+ point inspection checklist they said in their brochure. Let's just say that THAT process clearly needs some work. 4). Yep, there are issues with RV manufacturers but the bigger issue is this...once you've bought it, there is NOONE advocating for the RV consumer's rights. The RV industry has all the power. You have to hope the manufacturers stand by what they tell you and put in writing. So far, GD has done that. We would certainly buy another GD...hands down. Do we think something that costs more than the car I drive and the one ton diesel that pulls our 399TH together should be defect free? Well of course we do!! But, we are realistic. We hope you enjoy your GD as much as we enjoys ours. Show less

The floor plan was exactly what we were looking for. the quality of the interior was better than other models we looked at. But the dealer you buy from makes a BIG difference. Grand Design recommended Pleasureland in Ramsey, Mn. They give us a great deal on the price and were very accommodating around delivery. The quality inspection we don't believe was completed by the dealer. There were several items we called out during our inspection/walk-through that didn't get fixed so we had to go back several times to get them fixed which was a pain. the parts they ordered where wrong even though we took pictures of what needed to be fixed. The biggest issue was the back locking latch for the toy hauler gate was broken and would not lock. they would not fix it without the part. so we sent them the part and they sent back the wrong part. So we sent that one back and have yet to get a new one. Needless to say we have switched dealers we are working with now. We have made it through and summer successfully without too many issues. We did run into the gas heat not working constantly when there is snow on the roof. Haven't figured out why yet. Also, be careful that your doors are actually latched. You can lock then with them not being latched due to ice in the door gasket. Show less

We have been full time for over two year, first in our Grand Design Solitude 375 and now our Grand Design Momentum 399 and absolutely love the 399 and the room, features, and comfort. Grand Designs commitment to customer service is second to none also. Show less

We have not had a good experience. In fact, there are so many issues with our brand new Grand Design Momentum 399TH that I intended to launch a full internet campaign against Lazy Days RV and Grand Design RV. However, R.T. Kendall's messages recently reminded me that our Lord Jesus Christ teaches "total forgiveness". So instead, I will point out one disparity and then release the whole affair to God for His justice. Look closely at the attached pictures (pictures not available on this site). When I went online to get an insurance quote, I tried to insure my total investment; the value at number 2, the "bottom line" ($98,230.27). The website would not accept this value and a pop-up warning said it could not be insured for more than its retail value. I tried other values until I had to settle on the value at number 3 ($89,998). By this we know we paid full price. I assume the value at number 1 ($118,254) is used to make the buyer think he/she is getting a discount. There were NO discounts for us! Only the Devil's deception! Regardless of the poor rating represented by this review, there was one bright spot in our experience. That was our salesman, Bert Rios. Unlike most salespeople who do most of the talking and try to tell you what you want to buy, Bert listened intently to our concerns and guided us accordingly. God bless you, Bert! Show less

The worst RV we have ever owned! Had a flat less then 10 miles from the dealer. First night the hot water heater didn't work screws were falling out everywhere.tank monitors have never worked Happy Jack bed frame pulled away from the wall the living room chair smelled like it was burning and stopped working! After only four months we had 27 different issues took it in for repairs and came out with seven new issues. took the unit to the manufacturing warranty department and they wrecked it. A disaster is all I can say! I will never buy another grand design!we bought the unit new in July of 2017 Show less

to start off they are vary heavy to tow. the double door fridg is junk the flap on the door didnt close so i had to take the doors off install washers to raise them to clear the bottom and file the bottom of the flap and it still does not close all the time. i had someone come and look at it cost $100 did nothing and it still dont get cold enough. doors in the rest of the 5th wheel needed adjustment, the monitor on the cabinet for turning just about everything on and off is a real joke for the lights,thermostat,heat awning,a/c etc. you have to go through the hole routine to get anything to work. now the awning gets stuck and sometimes it wont go in or out for no reason so we cant even use it anymore im gone have to get in to the wiring to see if i can fix it. now 1 of the hydraulics is leaking really bad im having some one come to look at it im tired of working on and putting money in this brand new peace . i have had 4 other new campers none gave me any problems like this one and we have only had it for 3 months Show less

Best Rv and Manufacturer experience. Simplicity with and the modern amenities to make you feel at home away from home. Comfortable and spacious. Peace of mind while enjoying quality time with the family. Not working the whole time. Would definitely recommend and would purchase it again in a heartbeat! ? Show less