I'm not an expert, but at that high of a load rating you may have to go with OEM superduty wheels. It's kinda hard to find anything over 3600/3700 lbs.
Nice pics... some friendly observations.
1. Bobcats are loud as hell and Im not sure how you slept through that.
2. You got some leaves in your chicken plate.
I know some weekend warriors who fly in.. they buy all they need at wally world when they arrive and dump it or give it away when it;s time to fly out.. cheaper than flying it home... or flying your good gear out and back.