Brakes - Electric or Surge?

My dolly has surge brakes and they work fine. If the dolly tries to "push" the MH, the pressure will push on a brake "master cylinder" mounted on the hitch which will apply the brakes on the dolly. The harder you brake the MH, the more the dolly tries to push, and the more the surge brakes get applied.
If you buy the used dolly, replace the brake fluid, bleed the brakes and check their adjustment just to be safe. Put about 7000 miles on mine this year, about half on surface roads, as opposed to interstate highways, with no problems.

It cannot be flat-towed as it has an automatic transmission. The used dolly is a towmaster. The price is right but I'm unsure about the surge brakes.

I don't own one but, if its an Acme Tow Dolly I would not hesitate to buy it, if it's in good condition and the price is fair.

Check their website and compare the price of a new one against the used one.

Can it be flat towed?