Well there is the obvious: On a dolly the front wheels are up on the dolly and four down has all four wheels down.
Are you looking for cost differences? Difficulty differences? Ease of towing? hookup? pros vs cons?
Towing four down:
- All four wheels down
- Easy to hook up and go
- Costs can get expensive (far cheaper to DIY some of the installation)
- Can't back up
- You'll want a braking system (to be legal in many states)
- May require additional wiring (to hook up some rear brake lights)
- Limited selection of vehicles can be towed four down (although Jeeps are very popular four down toads)
- More $$ to setup for different vehicles (each vehicle will need its own baseplate)
Dolly towing:
- Most front wheel drive cars can be dolly towed
- May be cheaper than four down (a wash if you install your own baseplate for four down)
- Longer connecting/setup time (have to pull up on dolly, setup straps, crawl under for safety chains, etc.)--I usually can get ready to go in 15-25 minutes
- Can't back up
- No special setup for the car being towed (we tow either of our two cars--both front wheel drive)
- Dolly usually has its own brakes
- Dolly usually has its own brake lights (although people often add brake lights to the rear of the toad for greater visibility)
- Have to store dolly when camping (the one we use fits under the back of the coach somewhat)
- Have to store dolly when not camping (ours stays at the storage lot with the RV)
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