I agree with above... Take the time now to think about 'where' you want to go over the next few years. Then start looking around for where you can stay in those areas.. Treat it as if you were going there THIS year, as in search, look for availability, look for pictures (google, tripadvisor, reviews, etc.). I typically consider the RV parks' website as an indication but use other sources to 'know' for sure..
This will not only help you down the road in having an idea of options available but will also give you some idea of availability of those larger spots.
We just returned from a fantastic private campground in Minnesota with all the amenities but the $$ was a little steep. We also spent one night at a small town city park with just electrical but we were all alone and the cost was $15.00/night. You can also dry camp in wide open places in a lot of states but that is typically at least an hour from the tourist attractions. You pick which one you would enjoy the most.
For what it's worth, we are at 37' and the only thing we have had to worry about is HEIGHT not length.
Happy Camping!
2011 GMC 2500 D-Max Denali
2015 Palomino Columbus 325RL
Our kids have 4 legs. ๐