Yes you can! With the new Trip Planner, if you update the specs for the vehicle you are driving, then the trip will build around that when you update.
Whatever you chose in the set up process are translated over into "filters" for trip building. For example, if you chose RV or Trailer, campgrounds will be chosen to populate on the trip that meet those specs, leaving out options for canoe in sites, tent only, etc. You can change those filters after the trip is built, if you like.