I’ve got the same one on my max tow. Besides getting two of the left bed rails and waiting another week for the right side one, it’s been a good cover. We’ve been getting a few good thunderstorms up here in the TX panhandle the last few days and maybe a drop or two gets in.
I’m in the same boat. I’ve got a set of rubi coils lined out. 339 and 340. But my max tow is this weird format. 7801AA for front driver and 7802AA for the passenger.