The rule of thumb is the same as your tow vehicle drive tyres, to go a bit further checking your tyres pressure after a couple hours running your tyres pressure should be about 4 psi higher. If it is higher then 4 psi you will need to increase the tyre pressure, now if it's not then a small decrease is in order. There is other ways possibly talk with a tyre technician but be careful if he pucks number from any where he will not have clue.
Like a friend put a couple of new tyres on his van, tyre fitter said 65 as on the side of tyre that is so dumb. You know I can not get him to lower them because the tyre man said. They are only car tyres.
my own single axle van weighing in at sub 2000 kgs I run 42 psi took a couple of weeks, about 900 ks of testing and now I am happy with my pressures.
Hope this helps. Ralph.
ps. My brother is a race car engineer and using his experience has helped.
radar is on the money check tyre pressure tow the van till tyres are up to operating temp check tyre pressure if the pressure goes up by more than 4 psi that means the tyre is flexing an generating heat so you put a bit more psi start with 5 psi more drive some more check tyre pressure adjust up or down accordingly till the pressure stabilises
I just run 50 pound around, vehicle and van, never had a problem with these pressure. cheers blaze
Hi Charles,
We have been towing the same tandum rig 2000kg for years now. pump em up to 55psi cold. We run at 100kmph over long long distances to Nth West WA over a seven day period 5400km each way. Never had a blow out / flat tire.
Before this, lower pessures I was continually doing tyres and they were all red hot from flexing side walls.
Lite truck radials tyres are the go. Check the max cold pressure on the side wall of your tyres first.
Jim & Lambie
-- Edited by Hey Jim on Sunday 5th of July 2015 08:28:05 PM
thanks umpie1 of all the replies 3 of you have the same knowledge on tyre pressures your advise has been taken on board and will be used thanking every 1 for there advise happy travels