This gives you an idea of what it takes to sheath the Tiny House trailer. You’ll notice how I struggled on the very first board because I didn’t have the right screws. Make sure you get the right self-tapping screws! You want the ones rated for metal with countersunk heads. And don’t forget to pre-drill the wood. Depending on the screws you get, you might have to pre-drill the metal frame too.
Also, you might have trouble finding sill sealer. Go to Lowes to find them (at least in SoCal). Home Depot didn’t have any idea what I was looking for, not even on their website. I did find some in a Home Depot in Vegas though… There is some on Amazon though!