I've had Happijac on my truck for over fifteen years - no problem, and I shifted the 2003 HJ to the 2015 Chev when I bought it - needed a little modification tho'.
I had a 'fright' issue when I tried to bolt the rear tie-downs on that weak bumper. So, designed an anchor system that sits in the hitch ... and then anchor the rear to that... I'm bringing the TC back to the house Saturday to do some maintenance and will photo the anchor and post here - works really well ... the front is solid tho, and has the horizontal bar across the bed and bolted thru, so no issues there in all this time ... Camper is over 3000 lbs Lance 845.