There may be some items that are not quite as clear as you need, so I might statethem a different way.
On the motorhome, you are likely to already have the reciever hitch and you need to have a tow bar to go in that hitch if you are going with four down. Personally I would never go back to a tow dolly.
also on the rear of the MH, you are likely to have a big 7-pin connector with the wiring needed to do all the things needed to power the lights, turn signales, etc. on the car. But you will need what many call a tether to tie the Rv connector to one added on the front of the car.
A major part of the expense of settingup is the equipment and there are ways to cut that part if it is a major factor in your thinking. One big one is to shop the tow bar on e-bay! Used are often good enough as they actually wear very little other than collecting rust from hanging around on the back of the RV while camped or stored! I like Blue Ox but never used any others!
Then if looking for value, look at other than Rv places for the install work as many others do it cheaper. Think of the difference in going to a "specialty shop" versus where working people shop?
Truck hitch installers in my area do it for half the price of RV folks! They often also have the catalogs and info on ordering and installing what you need, so some talking the talk with several places and getting a written estimate can save a few hundred dollars.
It's the old story of quick and easy by drive in and say "do it" versus a bit more labor and time to sort lots to save lots!
hooking up is the main differencefor me. When doing dollies, it is cheaper but more work and some of that work is the dirty type. One has to manage to drag a dolly to the back of the RV and align it well enough to reach the hitch with the dolly tow point. Not always easy and often takes real thought to be able to do it in any campground with sloping roads and traffic wanting to get past. One person pulls a tow dolly, possibly uphill and connecting it to the hitch is not one I wanted to tackle after I passed fifty!
Then once you are hitched, you still have to drive the car onto the dolly and up tight against the front. Can be tricky if you have nobody to tell you to go 2 inches further left or right and you can't see? Then the fun part is getting down in the dirty and hugging the tires to get straps over or around them! On a hot day or nasty wet, I don't want that ever again!
With a tow bar like the Blue Ox, one pulls the Rv to a sopt out of the traffic, drives the car to more or less centered and about the right space from the MH and then gets out to connect. The tow bar arms are a sliding type that has lots of switvel and extend/retract motion to let you attach it to the tow car base plates if you get the car somewhat close to the right spot. When traveling alone, I bent a wire to attach to the hitch and had a flag on the end of the wire, so that when I got close enough the flag waved!!
On either system one still has to put the car in neutral or whatever is required and also plug in the tether and often a brake system for the tow car as most states require ist now. Brake away brakes are the name and it acts like the name. If the car hitch or something goes totally bad wrong, the car brakes are slammed on to stop the runaway!
Lots to study but a few pointers.
A current search on E-bay for Blue Ox for info on that route:
https://www.ebay.com/sch/i.html?_fro...+used&_sacat=0
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