It looks like I'll have to go back to 245's to get a load capacity I need. I never noticed the low capacity of the LTX I've been using(2 sets) might be the reason my tire is coming apart. Might look at Toyo M55's.
Whiz:
I was also confused. The unknown was the OEM steel GM wheel capacity (which apparently, is a closely-held number). We are def. going 265/75 R16 (on our OEM steel and chrome-plated 16 x 6.5 rims) this time (for all the reasons Travelnutz outlines in this thread), however, our payload will remain the same as always (1360 LB camper + passengers + 311 LBS cargo). This will give us
ample safety margin, with more contact patch\weight = lower tire heat generated, less tire wear, far less sidewall flex, etc, etc, etc.
Theoretically (and practically, based on very trusted advice), the larger tire and our standard payload on our OEM standard steel 6 x 6.5 rims, with the same air pressure we currently use in our OEM sized 245/75 R16 will not place absolutely any additional mechanical stress on our said rims. I'm comfortable and happy.