i too had thought about this but i havent had the situation come up. but what i was more worried about is what me and my close friends refer to as di. what do you do when you get di? and for clarification im reffering to the mud butt, hershey squirts, all the sick nasty names you could think of. especially in the situation of nobody being home or something. i remember years ago when we had our old van for my parents business it had a portable toilet thing. wasnt very big... if you get an enclosed trailer id look into it...