I think the biggest reason I'm thinking about doing this is because I'm planning on towing a trailer with a GVWR of 7495lbs. Now granted I would never have it loaded up to that weight. The GAWR is 4100lbs (rear) and the stock size tires that I want have a load rating of 2535lbs per tire. All of the math says the stock tires would handle it fine but I was always told to "save yourself the headach and tow with E rated tires". I suppose Ram wouldn't publish their tow rating and payload numbers with that size tire if it wasn't safe.
The Rebels come with load range E, I did buy the winter tires with the same load range E.
P rated tires should not be used on gravel roads, specially if you load your truck or tow moderately heavy.
My previous 2011 Ram Outdoorsman came with Goodyear Wrangler All Terrain load range C (6 ply), after they wore out I had replaced them with the Goodyear Wrangler Silent Armour load range E (10 ply), those tires had the winter snowflake marking, they were so much better than the previous tires in the winter. I would definitely get a set of those tires instead of the Goodyear Duratrak that are on my Rebel, I don’t off-road often and don’t require such an aggressive tire tread pattern for gravel roads.
Some tires are available with the load range D (8 ply) but for some reason they’re not as popular and are readily available.
I was expecting a much rougher ride with the E rated tires, but all I do is inflate them to the tire pressure that’s on the door sill, when I load the truck bed heavily or tow heavy I add pressure to the tires, 80 psi is the maximum pressure, I usually put 65 psi, remember it’s a half ton truck, these tires are also intended for 3/4 or 1 ton trucks.
Their are so many different tires available but like you posted, going with the E rated tires you will lower the risk of tire failure.
Look for sale prices and read the reviews.
Good luck