It's all a matter of your pin box and hitch height. On my '06 F-350, I have the hitch set all the way down(top set of holes)to keep my trailer level. My Lippert pin box is in the middle set of holes. On your Heartland, it's almost a certainty it will be different. I would recommend the middle bolt setting on your Curt. Hook up and see how level the trailer is and make your adjustments from there. You'll want to keep at LEAST 6" of space from the top of the bedrails to the underside of your fiver when hooked up, ready to travel.