Yim,
One thing that have not seen here is the suggestion that you rent something that is similar to what you might want and see if you really like the idea. If you buy something and then decide to trade up or down, no matter, then money will quickly be an issue.
As to a residence, there are places that specialize in providing permanent resident status for people in your planned situation.
As to campgrounds, we used to sail a cruising sloop, car camp, tent camp and now have an classic (maybe antique) motorhome and in the last decade which adds up to about 18 months on the road, we have probably paid for less than two dozen campsites not counting organized rallies. If you coach is self contained, you only need a dump and potable refill about once, maybe twice a week.
Do you know the classes of motorhomes? (These are descriptive and not value judgements.)
Class A - The drivers place is inside the coach. Most are based on highway buss shells. Up to 44' long and 40+K#. Ours is not one of these it is 20+ft, 10K# and only slightly large than a big van.
Class B - These are van conversions and/or stretches. They look like a van but may have a raised roof or an extended tail. These are best for "Stealth Camping".
Class C - This is the type that have a truck/van nose with a travel trailer on the back. This is a very wide class.
Class D - This is a recent and unagreed class. This is the type that are a medium duty truck chassis with a house on the back. Stealth camping is out.
Most fit in one of these categories, but sometimes only with a shoe horn. (Truck Horn?)
Where a modified trade van or a schoolie fits in here is an open topic.
There are organization you should learn about and look into and unfortunately, I only know of two and that would be the Family Motor Coach Association (FMCA) and Escapees (SKPS). I know that there are others, but that is what I know.....
Matt