The Goodyear Cargo G26 225/70R15 LRD is really the best 15 inch tire to insure no mishaps .
Next to that there is a Pirelli Scorpion ATR LT235/75R15 load range D tire placarded at 2335 # on the LT scale .
It is slightly larger than your ST225/75R15 .
The Scorpion ATR is 28.9" diameter and has a section width of 9.4 " .
The G26 is 27.4" diameter by 9 " section width .
The G26 is placarded at 2470 # .
Both only need 65 psi to get their rating .
Both are a better tire than the ST225/75R15 LRE .
The advantage of too much tire capacity is that you won't have a blowout in 115 degree heat in the Arizona desert where SprinklerMan resides .
Re aluminum wheels : Pull one off and look for a wheel load rating stamped inside the wheel .
Some aluminum wheels have a weight rating .
Maybe 5 % will also have a psi rating .
The G26 and Scorpion ATR are 65 psi tires and that is another reason why they are a better option than the ST tire LRE which need 80 psi to get their max rating .
