Speaking of campers, when renting or borrowing a friends motor home for a family outing always double check the straps securing the holding tank to the frame.
Returning home from the Michigan State Fair some years age I lost a full holding tank on Detroit's John Lodge Freeway. Coulden't figure out why every one was passing me with their windshield wipers running on a nice sunny Sunday afternoon until an older lady riding shot gun in a big Cadillac rolled her window down and experlative delegated, suggested I should pull over. It wasn't two minutes later another 'Dad' from our party pulled along side and yelled your tanks gone, you better get the hel outta here. Anyone who knows anything about Detroit clearly recognized the sage advice.
At a rest area twenty miles out of town we stopped to investigate and found the steel straps that hold the tank had completely rusted through thus dumping the tank and it's condense on the roadway.
We now have our own rig and many miles of great travel since that incident but always pay attention to what's going on underneath.
B. John