I too would just lay it on the line, tell them the truth of the matter, and have them find a solution to deal with it. If you are willing, the portable holding tank is not a bad idea, and the friends can be the one to haul it to the disposal site.
Heck, I opt for the campground toilets myself, whether pit or flush. I only use the one in the trailer for night time if there are no discrete trees nearby, or when stopped along the road.
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2017 Escape 5.0 TA
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
Most folks are about as happy as they make up their minds to be. Abraham Lincoln
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