U-Bolts breaking during installation

You just joined. To get the BEST info, you need to state what year and model Truck/van/car or motorhome you have. AS I stated, I have never seen u bolts used for a hitch in 43 years as an RV tech. I HAVE seen U bolts used for add on hitches that are not really rated. This includes 4 inch square bumpers on the rear of trailers that do use u bolts. But you state to the frame mount. Usually you have enough clearance to use regular bolts and not u bolts. Can you use regular bolts in place of the u Bolts? If so, this would be the BEST solution to your mount. Regardless of the U bolts. BTW, there have been numerous recalls(federal) over the past 30 years on REGULAR Motorhome bolted on Hitches from the OEM RV maker, due to wrong grade bolts used and also inadequate welds. This is different brands of hitches. So, listing the brand of hitch is not a real concern, and IF this is a problem across hundreds or thousands of these hitches, it would be a big help for some out there to realize they may have to check their hitches. Also, just posting the Brand you are having a problem with would not be a Libel concern. You are just stating what problem you had and are not disparaging the brand. Doug