Best off 4-up on/in a trailer. Towing is allowed 4-down for up to 120miles under 30mph according to my manual.

A friend of mine tows his 240D 4-down with a driveshaft disconnect, REMCO sells them www.remcotowing.com and a driveshaft shop can install it.

Personally, I've towed cars behind my BlueBirds through 39 states and Mexico, a dolly would be my last choice. If you want the convenience of no trailer, skip the complexity, risks, and weight of the dolly and get a driveshaft disconnect and decent towbar. Towing backwards doesn't work well with the alignment, will wear the front tires out faster. If you want the protection of wheels up, I like a nice enclosed trailer to keep other toys in, ... or you can go with an open trailer. I've towed both with an enclosed trailer and 4-down and they both have their advantages, depending on what you tow with and what you're towing.

- Jeff
190DT and projects