The older P-30 was not designed for low profile tires. On mine I tried two on the front and we couldn't get the front alignment to work with the wider tires and always wore off the inside edges. Went back to 8R19.5's and no problem. The rears have a narrower wheel and wore off both inside and outside edges of those wide tires.I have heard that some have got by and others didn't. Myself, The wide tires rode rougher and would transmit road shock to the steering wheel more than the 8R's. I have thought of the turbo but costs wouldn't make the conversion worth while.
1991 Chevy Pickup
1994 5th wheel 30 foot trailer