I have used G-Floor on two of my trailers. On the floor of my 6X12 and I also converted the front bed area of my 23' toy hauler to storage with tie down points and G-Floor. I can still use the area for a bed by tossing down an Aero bed or other air mattress for guests. This gives me somewhere to put stuff like the BBQ, chairs, cooler, gear bags etc. and it keeps them out of the walkway. I bought a roll of G-Floor at Costco in a 7.5x20' roll for $175. They have different colors and patterns such as striped, coin top, diamond plate. They also make it in different thicknesses. Here is a place online selling a roll for $128 that will do your whole trailer...
I know a friend of mine used that herculiner from pep boys and it looked good but he did not recommend it cause you can not really clean trailer out. Its destroys brooms cause its so rough. FYI