Looks to me like the tire deal would be the easiest and I can see those tires mounted on a rack with nice big wheels to roll it out of the way when not in use.
I'd cut a hole in the bottom of each tire and probably a hole in the side to insert a garden hose for the periodical wash down.
DF
Kind of what I'm thinking DF. I can build a rack that will hold the tires for a squeeze fit. The question is how long or how many tires does it take in a series to be most effective?
I was thinking that same thought.
If I was building one, I'd go my favorite tire store and see if they could collect me a set of 20" used tires, I'm thinking 10-12 or so. I'd get a couple and measure their width stacked side by side. I'd try to make the rack so a dozen or so would just fit.
I'd drill a half inch hole at the bottom and on the side. I'd cut a 2" hole with a saber saw, that way I'd have a drain at the bottom and holes in each tire on the side for a garden hose. To me, that would be the easiest way to flush out powder particles from time to time. Just go from tire to tire with the hose, letting the water drain out the bottom holes.
I'd get some large, industrial caster wheels with locks on at least two. That way you could roll the rig into position and lock one front and one rear wheel.
DF
