We tow a 5,500 pound travel trailer with P tires and they do just fine. There is a wide range of P tires. We got some very heavily built XL tires with a high load index. Another step up are LT tires that are C Rated. You can definitely do these on the factory wheel (50psi). Standard 1/2 ton factory wheels may not be rated for the 80 psi of an E rated tire.
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs