Once got hold of the formula the European tire makers use to determine advice pressure for car radial tires, and went running with it. Learned much in time by googling for it about the formula and a better one, and maximum load and difference between maxloadpressure/referencepressure/pressure needed for the maximum load and the maximum pressure of a tire.

Also do other things like in the house and did revision on Camper so can also answer questions about that.