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Greg, Who is "we", and if GM, where does one get this sheet? Dan "we prepare an information sheet for vehicle modifiers for some of our variants, outlining what they can and can't do load and CG wise and still remain within design parameters"

As we are looking at a relatively small/light camper, we are still a couple hundred lbs under the stock tire ratings, per tire, and going to the D or E tire would give use some comfort margin. tire "In any case, I would never overload a tire. Most 19.5 tires use commercial-grade materials...

Capri, Again, thanks for the info you have provided, it is really helpfull. Just to be clear, the tires the daughtor has were replacements, but they could have been the original model also, I don't know, as we got the car that way. They were a M+S tread design and "looked" like they would have...

Capri, You should write a book about tires. I noticed your comments from above and the part about chamber volume don't make sense to me, the higher pressure/higher load part does. Please explain. I always "thought" that it was the contact patch Area times Pressure that determined the Load...

Capri, Again thanks for your responses, lots of good info. Are these the ones that are "slippery" :) The daughtor had a set of new "something" Destinations on her Trailblazer, thes tires would very easily spin in just about any road condition, such that she was almost afraid to drive the...

Capri, Wow, thanks, just like being back in school. :) I think you answered my question, but certainly raised more. I think the answer is, There should be little difference in MPG between Load Range P, C, D or E tires. (assuming they all have similar construction layups) And with this...

Rod and Capri, Thanks for the responses. They provide some insite. Actually, increasing the number of plys is exactly what I'm looking at/for, ie, from a "P" rating, which may or may not be a 4 or 4+2 ply tire to either a D (at 8 plys) or E (at 10 plys). With max pressures at about 35 psi...

Interesting discussion. I just bought a 1/2 ton Chev, that I plan to put a small camper on. I didn't want the heavier truck, poor MPG and poor ride empty. Being a "big" guy, I wanted the full size truck, not the smaller versions, and I also want(dream) MPG close to 20 on the road unloaded. It...

Hi All, New here, I was searching for the above info and the discussions here seemed close so... Does anybody know the relationship between a light truck tire load rating, ie, Load ranges C, D, E, vs vehicle MPG? Years ago I replaced a set of "P" tires with some "LT" tires and I "think" I...