We got our MH in 2009. We didn't have a vehicle that could be towed, so we just went. For the most part, we were content with the amenities at the CG's we went to. The one CG had a shuttle bus that would take you different places. We rented a car just occasionally.
Fast forward 2 years - DH ended up needing dialysis. So we were free to travel more, but he HAD to have a car available for his treatments every other day. That got very expensive fast.
We ended up buying a cheap car - I told DH I didn't care what it was as long as it would get us from point A to point B and the a/c had to work. It was cheaper paying the insurance and tags on the little car than renting a car all the time.
When we purchased our used MH, we got a car dolly with it. So we use that. It's fine, but if I were buying a tow set up, I would prefer the tow bar type. I don't like having the dolly sitting around on the campsite. And there is a toll road in NJ where you are not allowed on with a tow dolly -- tow bars only.
I think you are smart getting a feel for the MH before adding the toad. Just go and have a good time, and you'll figure out what works for you. Like anything else, everyone has different preferences.
I've never seen a rental place on site at a CG. If there is a rental place nearby, some of them will come and pick you up, and take you back to their facility to do the paperwork. Will repeat in reverse for drop-off. The one place we passed on the way to our destination CG, so we would stop and pick up the car on the way in. Leaving, I'd drive the car and follow DH in the MH, to drop off. So there's different ways around it.