TYRE PRESSURE FOR A FORD CARGO 813?

Correct tyre pressure depends on:
(1) The tyre size (e.g. 8.25 R16 etc)
(2) The actual axle load.
If it's a horsebox there won't be any significant variation in axle loads so it simplifies it.
In nearly all tyre cases the front and rear pressures are the same.
Tell me the tyre size you have and I can give you the correct pressures for the different axle loads as per the Ford Cargo Workshop Manual (section 11 - Volume 1).

JD
August 2009