Running Both Air Conditioners On 30 Amp System

An adapter to plug your 30 amp plug in to a 50 amp service outlet could be made to get you one leg of the 50 amp breaker for a total of 50 amps available.
The problem is that if I read it right, you have a 30 amp coach so even tho you can get more amps out of the pedestal, your 30 amp main breaker will limit what you can actually use.
To use both AC it is better if you have some type of an Energy Management System.