Load rating of your tyre is 97 = 730Kg per tyre at 65psi (check the age of them, 5/7 years max depending on peoples views) even tyres with lots of tread can be an accident waiting to happen as the rubber perishes.
I have a version (dealer special) of the same 1991 Elddis Wisp called a Vogue SL. It took me a while to find out the correct tyre pressure. Alex has it right at 52psi, although I usually inflate to 55psi.
------------- The Sun always shines on TV.(and not on my caravan!)
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.