here is how to build your own cart.
Materials:
2 ) 6-8 ft 2x2 treated poles
1) old bike tire and rim from a kids bike
8 inches of all-thread
washers and nuts to fit all-thread
drill holes at one end of the 2x2's to fit the all-thread ( drill @ an angle so the handles will be hip width when attached to wheel)
replace axle from kids bike tire with all-thread
place 2x2's on the all-thread and secure w/ washers-nuts
lay the poles with wheel attached on top side of deer and lash deer to poles securely
roll deer over and start walking
Cost me $10 for the all-thread and 2x2 poles
best cart I ever used, Cheapest too