Agreed on the missile comment - Seen it happen before. I have shims between the frame and the Delta bumper so the bumper will bear shock load at the same time as the frame (which isn't all that stout) and I have max diameter 1/4" thick bearing washers on the lower bolts snugged behind the frame and torqued to 100 lb-ft. Same way I've seen pintle hitches mounted on gravel trucks in the past which have way more load on them than I'll encounter. Snugging against the Delta bumper gave me the extra piece of mind; while I may bend the assembly if something goes wrong and I snatch something too hard with unforgiving rigging I think the risk of pull-through is extremely low.Thanks I am really happy with how it came out.
Regarding your pintle hitch, you should be fine for light towing (think small utility trailer), but I wouldn't recommend using it for recovery. The shock loads that recovery will put on those threads could turn that whole pintle into a missile firing at the vehicle behind you that is either recovering you or you are recovering. The Delta bumper has two very stout recovery points built in already, I would use those with a rated shackle for all recoveries.
Also only planning on using this for my kinetic rope, so shock load will be minimized.
To be honest, I really like your set up. If it looks like it'll work with my air tank placement I'll likely upgrade.