I'd say even if you're off roading, which I do a ton of, I don't run a thick tire. I keep a full size spare, that's it. I don't have some major overlanding rig though, I drive south of Austin, way out west sometimes and occasionally new mexico/arizona/colorado. I can't speak for everywhere, but I get great mileage, ride, and plenty of fun done with a regular wildpeak 285/70/17. I don't go to the 10. the 6 is fine for me.Only about 6lbs difference between those two tires, so it won't make a huge difference in performance, but it could negatively impact ride quality to go to the 10-ply. As above, if you're not doing much off-roading, it's probably not worth it to get the 10-ply.
What about towing, would 4 ply be fine for towing anything the truck is capable of towing (Within the spec)?Our trucks are too light to make a 10 ply worth it in my very, very humble opinion. If you were doing a massive heavy overland build, 10 ply all day. Full size truck with a ton in the bed every single day running hot shot (tool delivery to way out of the city locations) yeah.
Me? It's me, two dogs, and a mostly empty bed beyond 10 gallons of gas and five gallons of water. extra 500 lbs in protection around her. I don't need a 10 ply.
Towed my boat (6000lb+) this summer with factory tires without issue. Would it have been better with a 10ply? Maybe.. is a 10ply necessary no.What about towing, would 4 ply be fine for towing anything the truck is capable of towing (Within the spec)?
Owner's manual has information about how to choose a load rating. Basically if the load rating of the tire divided by 1.10 is still greater than 50% of the gross axle weight rating, you're good to go. From what I've seen, even the 4-ply tires still have margin, so even if you're towing and have the axle at capacity, you're good.What about towing, would 4 ply be fine for towing anything the truck is capable of towing (Within the spec)?