Towing with E rated tires, that DON'T go to 80psi

I run 305/55/20 E-rated tires with max 65PSI towing a 12K lb 5th wheel. No issues what so ever. They tow great and are every bit as stable if not more than the stock tires.

When unloaded these tires provide a much better ride than the stock skinnies since you can run them at a much lower PSI (45-50PSI).

You will take a hit in fuel economy with the wider footprint. I probably lost 0.5-1 MPG average but the improved ride and traction make up for it IMO.