Apparently I finally found the weight limit of the air suspension . Lowered the truck for my third load of white oak firewood and it gave an overweight alarm on the cluster, gave a warning in the center and I had to drive it back ti the house in entry/exit mode. Once I got it unloaded, everything is clear and working normal again.
I didn’t snap a pic of the offending load but it didn’t seem much heavier than the first. The bed slide still rolled nice and smooth. I wouldn’t have thought the oak weighed more than some of the other loads I’ve hauled lately. Surely 17 sheets of 23/32 OSB and 24 sheets of 5/8” drywall would have been more than a jag of wood.