bighatnohorse - thank you for bringing my attention to the tire load ratings
Is that something that could be changed by buying different tires?
Do you find that the tire load rating is generally less than the vehicle payload - so you are erring on the side of caution using that number?
I imagine people may have added stuff to their pickup after market - perhaps a trip to the scale would be a good confirmation prior to buying - but you can use the tire rating as a quick rule out so you don't waste time looking at things that are way too light?