29' class C. Ford SuperDuty chasis. I have tried so many spots trying to take some bounce out of the camper, but I swear you'd think a newlywed couple is on their honeymoon every time you walk. Queen bed in the back. Wife is washing up, I'm in bed and dang near need Dramamine sometimes. Currently I have the front two about a foot ahead of entry step on the frame. The rear I have tried on the rear most point of the frame, on the corners of the rear bumper, and staggered on the frame. The directions say not to lift the vehicle, but just snug the stands until solid. Also looking at valterra RV stabilzer, wondering if that's any better. Think I'd rather take the 10 minutes and drink a beer.