Ford f450- RV Hitch

[Whirlwind]

I have a 2008 F450 with a Reese 20K Rv Hitch

My local Ford dealership recently reinstalled my RV hitch from my F350 to my F450. I have a couple questions for thought??

Using the 4"-5" factory star bolts that holds the factory bed to the frame, they went through the hitch rails and reattached. On the opposite side of the same rail, they used a carrage bolt and drilled through only the bed and attached with a large washer and nut. So in other words, there is only one bolt on each side of the rail that actually goes into and through the truck frame.

There are not other holes in the frame work of a F450 to attach brackets or other bolts into the rails. This dealership told me that Ford Motor Co. would void the factory warranty if holes were drilled into its frame work. So actually, there are 8 bolts holding my hitch down (4 going through the trucks main frame and 4 bolted only to the bed of the truck.)

Is this common for mounting a RV Hitch rail system into a Ford truck or would what would you do different? Any thoughts or comments -

The hitch seems to be tight and secure-

Whirlwind,
Lubbock,Texas