There are positives and negatives no matter which way you pull a toad..
on a trailer you can back up, on a dolly or 4 down you cannot.
1st make sure that the veh you will be using as a "toad" is able to be towed some can and then their are those that must be hauled on a trailer or use a dolly for the front wheels.
ALSO pay close attention to the weight of your toad ( + dolly or trailer) and add that into the total weight of the combination. you do not want to exceed the gvw of your towing unit.
(I tow a first gen xB with manual trans behind a class A)