We were looking at a keystone alpine last year it came new with many of the upgrades we have done to our current fifth wheel such as LED lighting G rated tires and some other stuff we liked in a little smaller trailer than our current one and was in a fair price range , then we looked a one in person it was nice but again sitting on the lot it had broken woodwork , and one of the slides did not work just like so many others we had looked at over the summer so we gave up on buying a new unit and will stay with our current fifth wheel which has been great but no longer produced. We will now go to a Truck Camper with three slides when we downsize. two years ago we were thinking about a motorhome and had the same quality issues as the fifth wheels , they are broken and falling apart just sitting on the dealers lots, so what happens when they are on the road everyday full timing? Anyway as other have said watch your weights a 38 footer on a 2500 even if the weights are close to ratings could turn in to a white knuckle ride and you don't want that sort of adventure you want to enjoy your retirement. Our current trailer is a 35 footer with 4 slides and is 15400 LBS max with a 2700 pin weight and is a perfect fit for our diesel DRW truck. A pleasure to tow compared to the first truck we towed the same trailer with which was a 2500 with the 8.1 gas motor from GM, the towing difference is like night and day between the 3500 DRW and the 2500 . Good luck in your travels
Mike