flat towing or tow dolly

I have done both, and I have put a vehicle on a flatbed trailer.
My truck is set up to tow four down. My PT Cruiser can be dolly towed, or I could install a lube pump and the baseplate for four down towing
There are pros and cons to each method. A search on this forum will likely turn up many discussions.
Most front wheel drive cars can be towed on a dolly.
Many vehicles can not be towed four down without expensive (yes, IMO, $700 to $1000 is expensive) modifications (lube pump, etc.). Then add in the cost of the towbar, braking system, lighting, etc.
A good dolly can be delivered to your door for about $1500 (http://www.americancardolly.com/). Or, you can buy a Demco for about $1700 (T1210) to $4000 (Kar Kaddy II) new or $2000 (more or less) used.
4X4 and AWD vehicles can not be towed on a dolly.
Most 4X4,s and some AWD vehicles can be towed four down.
Many rear wheel drive vehicles can not be dolly towed or towed four down. However, by disconnecting the driveshaft, they can be towed either way.
Whether you are dolly towing, towing four down, or on a trailer, you should stop after no more than 50 miles and inspect the tow to ensure that nothing has gone wrong. It is simply a good safety practice.
The best source of towing information about a vehicle is the Owner's Manual.
One can also check the REMCO website for information.
Motorhome Magazine has a pretty good list of towables.
It all boils down to personal choice. What do YOU want to tow, and what are you willing to do or willing to spend to accomplish it?

We traded the TT for a class A and wanted to go away right then. The wife said we need a car with us. We had a pickup an SUV and a car and none could be towed on a dolly. I traded in the car and put a hitch on the new(used) one and we tow 4 down.
The three we had could not be towed 4 down ether.

Once you learn how to use the straps properly, you can just keep gettin it! I have never heard of a car falling off a dolly because of loose straps. If you follow this forum you will see the number of people who have problems with towing 4 down verses dolly towing. Very few people have, once mastered, have any problems with a dolly. Get a good Demco and forget it.
Seven years, 75K miles, 2 cars 2 mohos one dolly.

I believe the general consensus is, towing 4 down is easier than a dolly.
However, there are pros and cons to each. With a dolly you can easily change toads. Most (if not all) front wheel drive cars can be dolly towed.
Do your research and decide what is best for you.

I much rather tow four down - less hook-up time, one less thing to maintain and I don't have to find room for the dolly.

Flat towing guide.

Bill