Looking at 40ft toy haulers, now how to choose a truck

we Have a 43' 5th wheel toyhauler and with 2 Harleys in it are well within the weight limit for our Denali crew cab dually. the trailer is a 3 axle and is 14000 dry weight. Weve been to Montana and back a different route, up and down the east coast and have never had a problem finding a campground that wouldnt fit a 43'. That includes national parks. Dont be scared off, the diesel duallies will do the job. and you won't have trouble finding campgrounds.