hey whichway,
Go for the larger portaloo. The one we have is a companion 24 ltr holding tank, 14 ltr freshwater tank. Buy the chemicals they camp shop sells. They even make the toilet smell nice. Until mr skippa uses it anyway. #
To empty it just dig a hole and bury the waste, flush out the loo with fresh water till you get home. Give it a good clean out at home, leave it all open till it dries out, then store it till the next trip. Your wife gets to have a laugh at you emptying it. #
Cheers Tracey
aka mrs skippa