Stay away from any "P" rated tire. They are rated at 4 plys and normally have a max press rating of 44psi. Think "P" equals "passenger car". "LT" tires (light truck) are available as "C" (6 ply rated,max press 50 psi), "D" (8 ply rated, max press 65 psi), "E" (10 ply rated, 80 psi max press). There are further ratings up through "F", "G". and so forth. The tread design on these tires can play a significant part in the overall ride, handling, noise, etc. You need to look at treads that are more attuned to those found on cars. Stay away from heavy, lugged treads that are more inline with off roading, etc.