I've been pulling my Vibe on a Demco KarKaddy SS dolly with surge brake for the past 10.5 years, 58,000 miles and over all kids of terrain (see map below). When I first got it there was a little problem with down hill brake application but I contacted Demco and they advised that there was an adjustment spring for this in their newer models. They sent me one (free of charge) and I installed it. Since then I’ve traveled in quite a few mountains with no brakes overheating. With surge brakes you can pull the dolly with any vehicle because there is no brake controller installation or activation required.
Demco’s KarKaddy SS is a little more expensive but here are three things that make it worth the extra dollars: 1) it is fully heavily galvanized so you never have to worry about rust. 2) Its tongue folds back and the ramps fold up so you can store it in about half the space others require. 3) Life time sealed wheel bearings that require no lubrication.
Good luck with your choice.
Dave