For the electrical gurus. Getting 50 Amp off two outlets?

I am considering buying a 5th wheel that has two air conditioning units with 50 amp service. The location where it will be placed permanently only has 30 AMP service, so I will not be able to run both at once. However, there is a standard outlet about 20 feet away from the camper that could technically give me the juice needed to un that 2nd AC when I need to. The question is - is it possible to somehow combine these two power sources into a single 50 AMP input? Its a bit easier on a boat because there are two separate input plugs.