We pull a 32' fiver with a crew cab dually and we spend the entire camping season in Wisconsin state parks. My opinion is that you have to be very selective where you go and do as much research online about the park where you intend to camp. You will be very surprised at how many campsites will be a nightmare to back into. Through experience we have our short list of sites at each of our favorite campgrounds that I am comfortable backing into. And it's a very limited list for sure.
The biggest factor seems to be how wide the access road is and if there are any obstructions on the opposite side of road to make the swing with your truck.
I haven't bent anything yet but that's because I've been insanely selective on choosing campsites wisely and always having a spotter with a cellphone or Walkie talkie.
Even after several years of camping with my rig its still looks pretty big pulling into a Wisconsin park. There's always lots of low hanging tree branches, tight corners and road signs to navigate around.
There are a few exceptions of course one being Harrington beach state park which is brand new not too many years ago and is laid out with big rigs in mind.
There have been a few parks that we always had on our radar to camp at and if we were camping somewhere close to them we would take the time to drive over and do a recon drive through. Two parks come to mind that luckily we did the drive thru and quickly determined we would never fit into any of the sites.
But you know what? Everybody's comfort level is different and I've already walked by sites with a bigger rig than mine and wondered how the heck they ever managed to back that thing in there....