[Berman]

I have the same truck, trailer and radio (futaba 4YWD) with the stock servos and mine runs fine, even with a small kid sitting on the trailer. The only time I have ever had a problem with mine shutting off (apart from a flat battery) is with the tamiya/molex plug, replace your battery connections with Deans, Powerpole, Traxxas or whatever your desired plug is, the tamiya ones lose contact easily and are only rated for 7.5 amps. Even if you think the plug is good it can lose contact inside. Mine were not allowing enough current for the MFC01 and kept switching it off.