I'm always tinkering - if I'm not maintaining the coach I'm improving it....its what i like to do.
Will stuff break, sure, will it ruin our trip....only if i let it ! We've got road side assistance and can cover the repairs....at the end of the day the coach is no more complicated or less reliable than anything else we own (how or cars)....theres nothing to say your car won't break down on a trip.
you can prepare all you want, theres still gonna be things that catch you by surprise....dont let it ruin your trip or time in the coach...sometimes the best laughs & memories come from UNPlanned events.