We go on road trips (wi-down south) a few times a year. I have the retrax pro, question for you fellas. What are my options when my gear is more than the retrax cover. Are there any solutions like a removable bed cover that can go over the retrax? Or am I stuck with tarp? How would you strap it on without having water channeling back into the bed if it rains to protect the gear? Thanks!