I got the RDS model 71083 45 gallon last year, before heading to Alaska. I was able to install it myself in only a short amount of time. The tank works great, I left it gravity fed and it will fill the truck tank without over filling it. Sure makes traveling great when you don't have to look for a service station that is RV friendly. This particular tank does stick a little bit over the top of the bed but only takes up about 10" of the bed.