As far as towing, we've done both trailer and four down. IMHO, a manual transmission is a PITA more often than not so I'll comment on cars with automatic transmissions. Motorhome magazine publishes a dinghy guide every year. The link is provided below.
(Note: I just looked at their site and they now charge $1.99 for their guides...do a google search for motorhome dinghy guide and you'll see the same guide for FREE..D)That said, try to read the owner's manual about recreational towing for advice. Most newer vehicles need a fuse pulled so you don't run down the battery. We tow a HHR, 3150 lbs, seats five and the rear seat folds flat for carrying stuff. Leather interior, sunroof heated seats etc. lots of comfort. Downside, Chevy decided to stop making them..:(...as for hookups consider a braking system for the toad/trailer. While many states do not require them, it's simply a feature that doesn't cost very much for that extra measure of safety. Better to have it and not need it than need it and not have it. If you decide on a tow bar, my preference, then consider a BlueOx baseplate mated to a Night Shift Auto ReadyBrute tow bar. The ReadyBrute has it's braking system built in so there's nothing extra to buy. (Except the readystop, recommended, that stops the toad automatically if it breaks away from the tow vehicle)
If you go the dolly route then get one with brakes on it..either surge or electric. Problem with the dollies is finding someplace to put it, (usually under the coach) and more things to deal with when towing, such as straps etc. The dolly offers you more choices on what you can pull...so that new Mercedes convertible you just bought your wife for Christmas can be taken camping with you....:W....see the links below...good luck...Dennis
Dinghy GuidesReadyBrake/ReadyBrute Tow Bars