We have a family landscape tree business where we use long winter plastic sleds (5' medium heavy duty) to pull our 6-8 foot tall trees from the harvest site to the new planting location (with time on our trailer in between). I reinforce the front lip of the sled with 10-12 inch lengths of wooden hockey sticks (top and bottom sandwiching the sled material) and hold it together with two strong eye bolts. I tie my extra long rope to the front. I've used these sleds dozens of times for deer and elk - snow and no snow. We are quartering/boning the elk and loading them on two or three sleds (whole deer on a single sled). Some "drags" have been the easiest ever due to snow and slight downhill conditions but even pulling over grass is doable. The reason for the extra long rope in front is to be able to get fully behind the sled on downhill runs where you can steer the sled from behind. We usually put the rope around our waist, just above the hips, and alternate pulling facing forward and facing backwards....as conditions warrant. The beauty of this system is that whenever you rest, you are not continuing to carry the weight. When faced with steeper uphill conditions, we team up on single sled. Though not ideal for every situation, it has worked very well for us. Hope this helps...