suggestion for cargo floor liner

Just purchased a new 5th wheel that has a large storage area in the rear under the living area. My issue is that it's approx. 6 feet deep and runs almost the entire width of the rig. It currently has a slick linoleum floor. Well I can already see anything I put in there is going sliding all over the place while on the road. I'm looking for suggestions for some type of floor covering that would be skid resistant. My front pass thru has a rubberized floor with a diamond plate pattern. Too bad they didn't install that in the rear as well.
Thanks