I also would not mess with a tow dolly.
To keep the weight of the Toad down we have on order a 2014 Subaru XV Crosstrek. It is the Limited package as that is the only one that you can get a manual trans in. You can't tow 4 down with the CVT trans. It is a AWD and has 8.7" of ground clearance so you can do some off roading with it. That is one of the reasons I went with it is I love to explore forest service roads and such. Also the cost of a manual Crosstrek is very reasonable. This car well be mostly used as a toad so I wanted to keep the cost down for the toad.
Jeep is a good one also in fact we have a Grand Cherokee that is 4 down towable but it is heavier than I want to tow with our Sprinter based MH.