tmmar & boowho
Yes all tires on any axle should have the same inflation.
For motorhomes like immar's that would mean his minimum inflation should be capable of handling 4830.
For motorhomes, Look up your size in the tire mfg's load/infl table and find the inflation that is rated for 4830 or more. That would eb your MINIMUM cold inflation. I suggest you add about 10% to that so you don't have to mess with adjusting inflation when the ambient temp changes.
Don't exceed the rating for the wheels.
For multi axle TT I suggest you run the inflation molded on the tire. This will help decrease the internal structural loads that are trying to tear the tire apart.
Different loading dynamics need different solutions. Most of the published information is based on old single axle TT.
TT owners might want to read THIS
General info on Inflation HERE