We recommend you check that the calculated tyre inflation pressure is correct. Do this by inflating the tyres to the calculated tyre pressure at cold temperature (caravan should not have been used for at least 2 hours). Then tow the caravan loaded to the weight used in the calculation for 100km (preferably highway driving to get heat into the tyres) and then measure the actual tyre pressure immediately after stopping. This will give you the hot inflation pressure. The hot reading will be 6psi (42kPa) warmer than the cold reading if the inflation temperature is correct. IF the hot pressure is more than 6psi the cold pressure, the tyre inflation pressure is too low, so inflation pressure needs to be increased. If the hot pressure is less than 6psi the cold pressure, the tyre inflation pressure is too high, so inflation pressure needs to be decreased.