We're 38K and usually pull a 24' enclosed trailer at probably 9K. We seem to cruise just fine and get knocked down to maybe 50-55 on some of our big mountain climbs here in AZ. We actually seem to do pretty good compared to a lot of other rigs we come across. I've always been pretty happy with our climbing capability until I hooked our friends 32' stacker up to our rig. The trailer weight probably only went up to 15K but man that thing pulled like it was full of lead. We were down to 35 MPH on our normal 50-55 MPH climb. I know our friends with newer 500HP engines can out pull us so I think you'll be pretty happy with the 515 and you may even get better mileage than us.
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