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depends on tyre size /type and  weight see/looking at second chart says 42 psi

http://www.tyreline.com/trailer_caravan_wheels_tyres/hs_trailer_tyres.aspx?Page=1

http://www.campingandcaravanningclub.co.uk/Documents/Wheels%20and%20Tyres%20for%20Caravans%20and%20Trailers.pdf

Have a look here http://www.tyresafe.org/tyre-safety/ click on Caravan Tyres .
Look at the tyre pressure table it has your tyres on there .

atb

Wizard

The 75 T shows the loading and the max speed. 75 load rating is 387kg, giving an axle loading of 774kg. You should only load a caravan to about 90% of the maximum load rating, giving 697kg. If your pop-up has an all up weight greated than this, and I suspect it does as mine is 1000kg, then you need new tyres with a higher load rating.

Only after that, I'd worry about the tyre pressure! There is a simple formula to work it out exactly.

Hi Brett

A load of 2500kg is huge, the tyres would be super heavy duty. I have had to replace mine this month due to a handbook problem, and I got Avon 8 plys, the strongest I could get. They have a load of 950kg each, still well below that figure of yours.

First look on your chassis on the A frame, mine's on the offside. It will give the maximum chassis load. To find which tyres you need, divide this max chassis load by 2 and add on about 10% as the safety factor. ie if you have a max chassis load of 1000kg, this gives a max load of 500kg per tyre (you ignore the weight on the towhitch) and add 10% safety factor, ie you need a max load of 550kg per tyre.

If you take this information and your tyre size to a decent tyre dealer, they should tell you what you need. A higher figure for the max tyre load is obviously good, but don't go below that.

Don't forget to check the spare this might be the correct rating if its not been used, though my tyres on a new van were below the 10% safety level.

Once you get new tyres, look at the max load rating of the tyres, and the max tyre pressure (it will be on the side of the tyre) then use the following formula:

                                       max chassis load x max tyre pressure
  Correct pressure =     ________________________________
                                                2 x max tyre load

The 2500kg should be read  as 2.500KGf/cm3  which translates roughly to 2.5 atm (Atmospheres), where 1 atm is approx 15 Ib per square inch. Therefore max pressure is 37.5lb per sq in. Thats to say , its nowt to do with the max load that the tyre can carry but is the recommended maximum pressure. Bloomin French !!

Just stick with freeatlasts info--- go for 8 ply higher load carrying tyres and accept that they are dearer but better than cheap car tyres

Thats good news.

Campers & Leisure are brilliant!