Most of us tow a small or mid-sized 4X4 with a transfer case that will shift to "neutrel" (sp?) to allow towing "four down". Then, you have to get a tow bar at around $1,000 (Roadmaster, Blue Ox, etc. Then there probably should be the auxilliary braking system integrated with the DP's system. Cost ??? Many of us use Brake Buddy type, costly but effective and easy to use.
The vast majority of MH'ers take a toad with them. You will find that most tow four down; some use the dolly; even fewer use the car carrier.
Ask around and observe. You will come up with the best solution for you!