I went through the Dolly Vs. Flat-tow decision process myself after buying a Class A last fall, and settled on flat tow.
We have two vehicles that both seat 6 or more (a toad requirement for us), but only one - our 2009 Odyssey - can be flat-towed. The reason I considered a dolly is that our Mazda 5 weighs 1000 pounds or so less than our Odyssey. After looking at the greater hassle that may be involved in dolly towing (mostly, regular stops to check the straps for tightness), the cost of a good dolly, and the fact that the weight of the dolly would mean the Mazda wouldn't weigh all _that_ much less than the Odyssey, I scratched dolly towing.
I wound up with a Blue Ox Aventa LX and Blue Ox baseplate, Road Master 10,000 pound 8" drop receiver (all new) and a Road Master Even Brake (used). We just got back from a trip of slightly over 3,000 miles and I was happy with the way everything performed. I haven't even put a 5 Star tune on my Ford V-10 yet, performance on the big western grades was adequate (meaning I only dropped below 50 MPH on the worst stretches of the worst grades, and only briefly). Everything is stock, except for a Banks Ram Air, which made a noticeable improvement compared to the factory air intake.
When the Odyssey is off the MH and the tow pins are off, it's very discreet. Unless you tow yourself, you probably wouldn't notice that it's set up for towing.
Of course, if I were going to buy a toad for the purpose of towing, I'd really want a Jeep. The only thing stopping me, of course, would be lack of a six-passenger Jeep. If Jeep ever makes such a thing, it'll probably exceed my 5,000 pound towing limit, just to further torment me lol.
JB, wife Thuy, 3 daughters, my dad, cats Lyn and Sami
2008 Fleetwood Bounder 35H/2009 Honda Odyssey toad
San Diego, California