I was in the automobile business for just shy of 30 years, and used a tow dolly on a daily basis. Early on I bought a Demco (Dethmers Mfg. Co.) with surge brakes. One of the best investments I ever made. All galvanized construction (other than the plastic fenders). Built like a fortress and never, NEVER an issue over all the years I owned it (other than tire replacements, of course). They're not cheap, but you will not find a better product. And, when and if you get ready to sell it, buyers will line up for it, because everyone appreciates quality.