We've found the use of shavings absorbs much of the moisture that contributes to slippery mats. We tried sawdust and were not pleased at how much of it blew around, when the windows were dropped down while traveling.

We have an industrial paper shredder. Shredded paper bedding works very well, not only for the trailer, but the stalls as well. It breaks down well in gardens, and has none of the acidic problems, found in the wood by products when used as a mulch.

I've read where feed pellets were favourably used; they became more absorbent as they are crushed.

The mats are less slippery while using a bedding, even straw. The horses are more stable and have better footing.

BOL  Gard

Just be sure to clean it alllll out when you're done.  Don't leave it to sit in the trailer.  I had a big stock trailer, and I'd use straw for bedding because there was no hope that shavings or sawdust would stay put.  I had a horse who had some bad allergies and the shavings dust would give her the snots when we traveled.

Amanda

Shavings or sawdust will only get wet and slippery if they are really soaked. unless your horse LIVES in a trailer for days at a time, mostly likely you won't have to worry about that happening.

Short trips you can manage with nothing on the mats if you prefer but really using something is ideal. I have used sawdust without probelms assocaited ( and I don't water it down) and straw ( as I have it easily available) I don't have a preference. Whatever you have on hand will do.