You’re going to get all the medics excited with this thread lol. I use a PJ SKED for whitetail here in NC. A SKEDCO or a FOXTROT litter are essentially what you’re taking about. You can find them used at a reasonable price but if you aren’t planning on carrying them (with your hands) then their size/weight may be excessive. You could use both as a starting point for making something out of HDPE. Belaying the sled on steep terrain is too easy as well.