I've got a cabela's super mag hauler.   It is a really heavy duty cart......550 lbs capacity and I have used it up to 400 lbs and it performed very well.  The alternative (when you don't have or can't use a quad) is a lot of work lol.  It is a tad heavy at 31 lbs, I think, but it is worth the extra weight.  I've also made made a homebrew cart out of electrical conduit (emt) and a wheel chair.  This cart is very light and I have used it to haul out whole deer with no problem as well.  Plans for the homebrew cart are on my website under D-I-Y and the Cabela's cart is reviewed under Product Reviews.