Tire question: Lt's vs P-Metric on a 2004

I need to replace the tires on my 2004 Rodeo and am debating between Michelin LT's from Costco and Firestone's. The Michelin's are LT's and I've only used P-Metric 245/70-16's to this point on this truck and two other Rodeo's. Cost is about $100 more per set for the Michelin's, but I'd get a 70K wear tire (versus 60K for the Firestone's) and Costco's road hazard with that.

I don't take this Rodeo off-road or give it hard use, it's just a daily driver. I don't want it to ride like a lumber wagon--so am wary of LT's. Any suggestions? Thanks