We too are upgrading from a 26 foot tt to a 31 foot fw. will actually have about a foot less behind the truck. Won't be able to go to a couple places any more but will still be able to go just about everywhere we like. tight corners etc will or may be a challenge and if we can't get into the campground we will move on and park outside and do day trips in and around form our base camp. But like the others say, I believe most parks and national parks will be able to accommodate us. We have been in about 20 of our National parks and saw lots of large units. Just Do It ! ! !