Chewing on this further, looking in the manual it only gives the one pressure 55lb all round (page 370 of TM9-801). It makes no mention of whether the vehicle is loaded or unloaded. Therefore it could be assumed/construed to that avoid issues such as tyre-wall damage/failure the 55lb would have been set by definition to cover vehicle operations when fully loaded which on a 352b1 is 9,167lb + 5,000lb = 14,167lb.
Taking a step back for a moment, and looking in the manual which comes with your normal car, it normally gives pressures for the front and back (which are frequently different) and gives figures for normal operations, and also when fully heavily loaded. The latter always being higher than for the former. This thinking is further supported by the 1lb extra for each 1,000lb overload referred to earlier in this thread. If you follow the rationale that the 55lb is for fully loaded, then running the vehicle when it is 35% lighter (i.e. at 9,167lb) surely means by definition the tyres would have to be over-inflated ?
An interesting follow on question is what pressure should the front be set at ? Given the vehicle weight distribution it could be argued that the rear tyres are disproportionately affected by variations in the overall vehicle weight, although not exclusively so…
Kind regards to all
Vulture