Lance 855S on a F350 SRW?

We have a Lance 1010 and 2009 F350 SRW 11.5k GRVW. I have the same Michelins. My total weight is 12.4k roughly evenly balanced between the 2 axles. We drove the camper from CA to Yellowstone no issues. Later in the summer headed up to Yosemite and had a blowout - thank goodness for Ford's tire pressure alert on the dash. the tires barely had 2,000 miles on them. I'm pretty cautious about making sure I have 80lbs in the tires.....I may have been closer to 70. This said, I really was surprise pd this happened. Really don't want the added expense of Alcoa rims and new tires. I purchased a real good tire inflator in the hopes that I can keep the tire pressure where it needs to be. I posted a topic a few months ago and the feedback indicated the tires should be sufficient. I'm driving the truck a bit easier.....especially on whoops. NEt-net, we are pushing the payload envelope, so we must be a bit more careful. Maybe in a few years upgrade to 19.5" rims at a cost of ~$2,500 I think that 3750 is the best for E rated. You can read this post for more feedback on the topic. Older/recent thread on Topic