I think you need to tell us a little more about yourselves. What type of RV do you have, are you on a tight budget and looking for low cost camping spots or are hook-ups a priority. What sort of things do you like to do. Are you interested in bicycling or hiking trails, kayaking, National Park attractions etc. When do you plan to travel? If during prime summer months reservations at state/provincial parks and national parks should be taken into consideration. Do you want to be on the move a lot, or settle someplace for several days and do day tripping. Age - travel medical insurance for the time you are in the US could be quite expensive. Look into that before making firm plans. Do NOT travel in US without it.
If we have some answers - you will get more useful help that suits your plans.