Just to be certain, you cannot ride in a trailer while it is being towed. Also, when using an RV you will often have to follow truck speed limits (55-60mph most often) and will slow down some going up and down big hills/mountain passes. When going down passes and large hills NEVER ride the brake!! Gear down and brake hard occasionally to slow down. Slow = safe.
TV options, likely only over air or cable TV in some parks. Netflix and Hulu require you to have a subscription and a smart TV with internet access.
Your adventure sounds wonderful but I too would think less miles rather than more. Being overly tired and pressed for time is a vacation killer. With little ones, you will need to take breaks from the road. Popular NAtional Parks can be VERY busy in peak tourist months, causing the need for more time to see them and to drive to them.
Parking along the roads/highways is not allowed often. There is some boondocking(parking with out services) on Bureau of Land Management (BLM) land out west but only in specified areas. Some find lots of boondocking sites but if getting from point to point is your goal, may not be reasonable to search them out often. Walmart stores have allowed overnighting at some but mnay are now saying NO to abuse or local laws.
I wish you luck with your planning. Sounds like an amazing adventure. Keep reading and asking questions - start a new thread of inquiry here that is very specific will get you the best answers! Good luck!
