30 amp is really 20amp

hmmm, I can say that I have to ask for a 50 amp site because the moment I turn on my AC the circuit breaker on the pedestal trips on every CG I have stayed at so far since buying my 2013 TT in April of 2013 and I have had it in for warranty work and had that checked and will again in September as with ONLY the AC on and NO other appliances it trips "Unless" I have it plugged into the 50 amp via the adaptor. I have been wanting as I do have a degree in Electronics although many moons ago to measure the actual amperage being used or drawn just before the 30 amp trips and what is powered up at the time and then run that same test connected to the 50 amp to see what the actual draw is for all items powered. It would very devious for CG owner to have only 20 amp service supplied by a 30 amp receptacle although it can be done and would save the CG owner money I am not sure if the legallities and or the customer complaints would be worth the trouble.