I went from many years of travel trailers and different sizes to this year a 5er. My previous TT was 32'/8800lbs and towed ok most of the time, the new 5er though is so much better.
IM not going to tell you how It tows so well you forget about it because that is BS! I know it is there now it is just a couple feet behind the cab of the truck, but I am getting used to that. It is easier to hook up and being a toy haler I have plenty of room to bring whatever I want, My truck is a long bed so I have plenty of room for firewood. Fuel mileage, improved about .5mpg, maybe my driving attitude has changed now that I see 38' of trailer behind me.
In the end I am very happy with the move to the 5th wheel, but also loved out previous trailer....but I am in no rush to go back to a tt.