Yes, you will have to look for a while to find a 6.0, extended with buckets, Those were my requirements and it took several months to find one anywhere in the US! Can you explain what you mean about the bolts? I just installed my hitch and the "factory" bolts from the hitch manuf seem fine.

 

Not speaking for William, but, I assume he meant the bolts that came from gm. When I bought my 08, it had the z82 option (towing package), which includes a gm installed class IV receiver hitch and pre-wiring for a brake controller. One of the bolts holding the hitch to the van frame broke, so I went ahead and replaced them all with some bigger, thicker bolts.