Yes I've been able to run all three of mine on 50A the few times I've needed them and that's the reason my rig has a 10K generator, not a 7.5.
Unfortunately when you need three ACs everyone else in the CG is using all they have too. Your management system is going to shut your rig down around 108 V to protect mainly any motors/compressors. The closer you are to the transformer supplying the power the better chance you have of higher Voltage. This drop is usually a CG problem of too small wires for the distance from the transformer and more likely a problem when they only have 30 amp service.
