We have a Chevy 3500 with a way older model 9.5 hard side camper. Use the Hapijac tiedowns and no problems. No gas fill issue. We travel highways and back trails as well, had encounter with deer last week requiring hard stop and no movement or damage to camper, truck or tiedowns. This is the third set we have had during our 47 years of camping with no failures. Rear tiedowns are fine on our bumper but then it's an 04 Chevy with beefed up bumper versus the ones on newer trucks nowadays, any make. We've never had a problem and the front brackets DO bolt down THRU the bed and attach TO THE TRUCK FRAME not just the bed as some folks seem to think. The "L" brackets at the front the bed hold the centering guide bar, not the camper itself. The anchor tabs are secured thru the bed, bar and brackets to "L" brackets as well and go to the frame.