Sorry Zebra, been on a little "spring break" time off.
My 6215 has 18.4 30's on the rear, and 12.4 24's on the front, (I think). I'm at work now and doing this from memory. Maybe 13.6 24's on the front. Yes, with the loader, you are probably right, pushing over 10,000 lbs. Also, I re-read my earlier post, the controls are all on the right hand consol, the power reverser is on the left.
I checked on more weight, looks like cast iron is running around $1 per pound. May put water in the rear tires, just not sure yet. Any thoughts?