I completely understand your concerns and have somewhat contemplated the same thing... however, and as others have pointed out, I don't think the added ~3 feet is going be much a problem.
My current TT is 30', point to bumper, and is a 26BHS. My desires are to get into more remote areas within the Rockies as there are many areas in the off-the-beaten-path high country that have switch-backs which makes it a serious no-no to even attempt getting my TT up there. But here's the point, I wouldn't take your trailer up there either as it too would be a disaster waiting to happen. I have no reservations of taking my current TT up over stuff like Colorado's Cottonwood Pass in the summer and would do similar passes but when it comes to tight switchbacks, no way would I consider it with almost every TT out there... some very minor exceptions.
If you really want to be mostly limitless for off-the-beaten-path areas, a slide-in truck camper on a 4x4 truck would be the way to go. So, go for it and get that new Nash 25C, you will 100% appreciate the extra length room, bunk and slide for a much more spacious area to live in.