You will have to adjust your travel style a bit. I think the reason that you haven't seen this issue mentioned much is because most people drive straight to their destination then do all of their sightseeing in their car. We have a 25' RV and don't tow so we have to fit in the parking lot of any place that we want to see. We also like to stop along the way. It's not always easy with our little rig and there have been many places where your trailer and van just would not fit.
If you know where you would like to stop to give the kids a break try searching for parks etc. on a site like
tripadvisor When you decide on a good attraction take a look at the parking lot on Google satellite view. You should be able to get an idea of the parking situation.
