I have a bed slide in my Ram 3500 and a lockable hard cover (not a shell). It works great. The trucks are built so high now that it is hard to reach over the side to get something out of the bed. The slide removes that problem. It does cause you to lose a little space but I put small things on the side (not on the slide) like Lynx leveler blocks, Roto chocks, etc. I am not able to pull the slide out to the first locking point with the TT hooked up to the truck but I rarely need to do that anyway. I think you'll like it. I do.