I had a old truck box liner that I cut up into 8" stripes and installed them the other day on my new trailer. saved me a couple hundreds bucks doing it this way.
If you don't mind spending a couple hundred bucks then Superglides work awesome for sleds and quads.You can also get X-glides at a liqudation place on 156 street for around 80 bucks a box if they have any left. they are pretty similar to Superglides.
A buddy and I have both bought and installed Gator Glides from AB Plastics (a forum sponsor from Devon AB). They are great on the flat, and a whole lot easier on the knee's when fastening sleds and tarps. We both have Super Glides on our ramps as they have better grip for walking up and down. JMO