So the OEM LT265/70R17 tires were toast when I bought the truck used with 35K miles on it.

I put some Cooper AT3's in LT285/75 R17 E.

Well the truck sits a little high for my 5th wheel and these didn't help that any plus I have only 6/32 left after only 28K miles, so clearly these do not stand up to towing a 10K, 5th wheel.

I think they are just slightly too tall and when towing. I'm not in the sweet spot rpm wise unless I'm driving too fast for towing in 6th and I end up towing a lot in 5th.

I'm now looking for more of a highway tire that will wear well, but it has to have the "M+S" symbol or I can't use it here in BC in the winter.

I don't take my truck off road ever and rarely even on gravel...pretty much all highway and towing 75% of the time.

I'm thinking an LT295/70R17 E?

Any suggestions?