Can you unhook your truck while there? If so, it may not be a problem because you can angle the truck into the space. Most sites suitable for an RV there just have a log on the ground at the back end of the space and you can put the tail end of the trailer over the log.
But you may face two problems: 1) they do not take reservations at Canyon (ie., you just have to take whatever space is vacant and the best sites are never vacant) and 2) it is heavily treed and some spaces are barely wider than the trailer (ie., your truck can't be angled in).
