I have a 6x10 Cam dump trailer. I love it and it fits my needs perfectly. I use it to dump horse manure from my farm. Of course, occasionally there are rocks that get in there and scratch the bed of the trailer on the way down. The horse "waste" is very acidic and cause rust very easily. In the winder everything freezes in there as I only dump it every three days. Is there anything that can protect it and help it slide easier? I need something that is pretty slippery to get everything out. Is Linex the way to go or is there something else that is a little cheaper?