Look at the Trailer Valet, it's a jack and a hand crank chain drive with high and low gear. I run my tandem tow dolly up and down a pretty good incline on my driveway with no problems, double pneumatic tires make maneuvering easy and I can park it in the tightest of spaces. Well worth the cost. $300 new, and you can order separate base plates to move the unit to other trailers. I plan to get a base for my utility trailer.
2015 Georgetown 364TS, '14 Fiesta 5 spd w/Tandem Tow Dolly HDXL 8x10, & EZGO Customized Cart
'16 - 51 days camping so far, 19 more min planned; '15 - 56 days
2011 Flagstaff V-Lite 30WFKS '14 - 24, '13 - 33, '12 - 36, '11 - 29, '10 - 23