Cryppie--the installation on the firestone instructions are INCORRECT. If you cut away the plastic as the diagram in the instruction states, when you load your truck substantially, the residual plastic will come down and tear a gash in your airbag. My friend loaded his camper and left on a trip. When he arrived, there was a gash in the airbag from sway(even with the bags). He contacted firestone(who told him to pound sand) and then a dealer. Dealer said all bags they install on 3/4 trucks have to be trimmed about an inch more than regular... . good luck...