Get a tank about three times larger then hire a helicopter cargo service to suspend it 1500 feet over yourtrailer and its enclosed crapper. Okay?
Now go on in there and blow a load.......then flush. The pressure should be sufficient to blast your sorry ass AND the crapper through the roof of the trailer. When you have reached an altitude of 150 feet (that'd be about right)snd safely out of the "drop zone", the helo pilot will release the tank and it will fall on your whole friggin' project smashing it to hell and begone which seems to me to be the best place for it.