Heve a look at this excellent site https://www.tyresafe.org/motorhome-tyre-pressure/ just put in the actual axle weights and tyre size and it gives the recommended inflation pressures for the weight carried.
Note: If your mh has CP tyres the rear axle will always be 5.5 bar. When entering my details I picked the ordinary C (Commercial) version of the tyre and it will give a lower pressure which is more comfortable for plodding around on our poor road surfaces.
Note: If your mh has CP tyres the rear axle will always be 5.5 bar. When entering my details I picked the ordinary C (Commercial) version of the tyre and it will give a lower pressure which is more comfortable for plodding around on our poor road surfaces.