Dave I know what you mean about some stuff at Tractor supply, but they do have one tough looking trailer, it's poly bed is what I would want, I have a poly garden cart and it's indestructible.
This looks like a pretty good deal, it's not too big to get around in tight places and has a swiveling dump bed with a 12" ground clearance.
http://www.tractorsupply.com/ohio-steel-professional-grade-12-5-cu-ft-swivel-dump-cart-1027885
