I would get one with surge brakes. No wiring or special connections for the MH. The extra cost, priceless if it saves that one in a million accident. If you decide later to go 4 down, you will probably recoup the extra $, and be easier to sell. Before going 4 down, our dolly had surge brakes, only recall the dolly brakes coming on once in a panic stop (long story), but they did make a noticeable increase in braking power.
As for the laws, every jurisdiction (state or province) have there own and then each have there own interpretation as to whether a car is a trailer, towed, 4down dolly.
Ken
