I have a PowerCaster that I used with a tandem axle boat trailer for years. It worked great except on wet grass as was mentioned above. Plenty of torque to move my 4,500 pound boat and make sharp turns where the wheels would slide.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof