we recently went from a 27' TT to a 36' 5er. The overall length from bumper to bumper was relatively the same. The 5er is much nicer to tow. It is a much smoother ride. Backing is a bit different and is something you will have to get used to, especially after being used to backing a TT. And if your 350's turning radius is as bad as my 250, expect to be doing a lot of, going up and back. As far as driving it, you will like it much better.
2016 Forest River Wildcat 314BHX
2019 Ford F-450 Limited DRW 6.7 Diesel