Hey guys thanks for the replys. As for the material, I am costing out the difference between alum vs plastic. So far the cost is pretty equal between the two, but I am leanig to alum. $25-$30, anodized blue with bolt and seal. I should have them available in two weeks(sorry). As for a cover that goes over the installed filter..thats another issue. I assume that you have an open trailer and want to protect the filter from the elements? I can look into that, but the filter is so easy to put on, that you can put your filter on when you get to your destination, but if there is a demand, I'll do my best!