I hauled my bike on my open bike trailer from MN to AZ when I moved in December of '07 - nearly 1/2 of the 1,800 mile trip was through slop/sand/salt. It pained me to drag it through it all that, but I used S100 and very careful use of a pressure washer and all was fine. I wish I had a enclosed trailer, but space was an issue, so I have an Aluma MC10F folding trailer with a Condor wheel chock - a set up made for safely hauling a bike, as long as the weather is nice.
I'd go without a cover or wrapping and just find a self service car wash when you get there. Just my 2 cents.