Not necessarily. Load range "B" is a 4 ply rating. The ply rating isn't the actual ply count in the tire, but an equivalent strength rating compared to bias ply tires.

crosscountry
 

been running mickey thompson baja atz 33x12.50 on 20's almost 24,000 miles on em pulling my fithwheel and my d6 all over the place mainly hwy miles since i travel crosscountry for work and i still have 75% tread left on all 4 with no uneven wear and ive tried nitto, bfg both and they are no comparison from my experience :choochoo::choochoo: load range E is all i ever run no one likes possible blow outs in the middle of the night in the middle of no where

I heard the exact opposite that those didn't last at all, good to hear that's not true.

I like that tire too... may have to look into those before I make a purchase.

For what its worth, I am running the Nitto Terra Grappler in a 305/70/17 with an E rating on my '09 2500 4x4 and they've been great. I put these tires on before I installed a 2-inch leveling kit on the front and they did not rub. Now that she's leveled, the truck looks good. We do a reasonable amount of towing with 28-ft bumper-tow RV and the tires seem to be holding up well. I suspect I'll easily get 40K miles and probably will go 50K.

Load ranges
 

Sorry for the slow reply, havn't seen this thread in a while, to answer your question, No . Ply's such as 10 ply, or 8 ply originally from bias ply tires, the number of layers determined the weight carrying capacity of the tire. On todays radials P series (passenger) have a load index number wich determines carrying capacity, you can find a chart online wich converts the load index number to lbs. LT (light truck) tires have a load range such as C, D, or E and it's position in the alphabet doubled is just a comparison to old bias weight capacity. Most P series radials are 1 or 2 ply layers, while LT tires even E, F, or G rated only actually have 2 or 3 Ply layers, they're just much stronger than thier bias predessors 10, 12, and 14ply. In addition to the load range most LT tires also have the carring capacity in LBS in smaller print somewhere on the sidewall. It will have the capacity for single, as well as Dual wheel configurations, If you look at different brands and models of tires you will see that not all E rated tires, or whatever letter are the same. Hope this info helps you :c:

i know mine isnt a newer dodge but for towing my goosneck trailer with a 12k mini excavator i m running the cooper stt 315/75/16

Thats an agressive tire, Bet they sing pretty good goin down the road :c:

no realy with the sound of my turbo drounding everything out

Ahh, someday I'll get a bigger turbo :c:

Tireman is dead on, not all tires that say "E" rated are fully 10 ply but are weight rated. Read on each tires design specs if you can, they will say how they are intended to be used. Toyo has a new tuff duty rating but again only in 265/70 sizes. A true 10 ply E rated tire like the michelins and some of those have a far stiffer sidewall, will run truer on the road with a load, and will get much better mileage than some of the "so called E rated" tires. 30 years of towing loads teaches you the difference.