Our main drain under our trailer got clogged and we didn't realize until our waste started backing up into the bath tub. Now we can not open the main clean out because there is so much water in the pipes from the drains that just opening it will flood out under our trailer, BUT we also can not just empty the water into pails because the pressure from all of the water is too strong till get a smooth flow to fill the pails with out flooding. I need help asap. We can not use any water until this is fixed, even using the bathroom is out of the question. Please hear my prayers!

You or some one with skills must rod down that main drain. Do you have or know anyone with a sewer rod or snake?

It can be cleaned through the vent pipe. Also you may have to open it up and have to clean up the mess under the trailer.

we can not open the main clean out because there is so much water in the pipes from the drains that just opening it will flood out under our trailer Better a flood under the trailer then in the trailer. It sounds like the clog's downstream from the clog so that's where I'd snake ftom.
As Chuck sez, you can snake from a roof vent but that means threading the snake all the way through the interial drainage in the trailer before you can reach the source of the problem. Good luck, Tom