I'm in the same geographic area as you are, and switched last year from a 28ft total length bumper pull to the current 5er listed at 35ft. The bumper pull was designed for off road, with the low point being 18 inches off the ground. My 5er sits high, but due to length it's really easy to bottom out. We really are limited to where we can get into compared to the last rig, was itself limited in comparison. to the ones that came before it.
With the bigger rig you're going to find it hard to find anyplace you can make it to in the Uintah's on weekends. You'll be to big for logan canyon campground wise, and most dirt roads/spots in the hills west of bear lake. You'll also be quite limited in the Swell area, Henry mountains, Castle country etc. more so in the mountains and hills than the desert, but even the desert will present many areas where bed rail clearance and bottoming out are real issues.
In my case, keeping the wife happy was a driving factor. Myself, the old highly modified off road popup I used to have was the ultimate camping machine as with the truck I pulled it with I could get into areas I can't get into with my 3500 Ram 4X4 not towing anything.