Djs pretty much nailed it. Look at the app and any aerial view of the fort. Make the notes and order of preference and let the desk know what could work for you.
There are no guarantees, but it will help when you check in. Also, I would check in onsite so you can negotiate if needed.
We stayed in the 100 loop with a 40 Scepter and made it on the first shot. My DD and family had about a 38' TT and they were fine.
We had 121 and 122.
I guess it depends on your expertise when backing up. I've seen plenty of CDL drivers who know what forward is but can't back up worth a dam..... Had to commandeer a few big rigs on my farm when the drivers where useless.
Narrow down your choices and stick to it.
GGC got a reaction from djsamuel in Preferred Loop - 35' deep slide TT - which loop?