We've had this one before. Jim, I appreciate that you can't argue with success, and I nowadays carry half the kit I did ten or fifteen years ago, but:
Cobblers!
Every time I load up the canary yellow, preloved and battle scarred ex AA Transit, I smile at the thought that I don't have to play Tetris with the kit, and I can take spares/backup/options should I wish. Always a second full PA for a start. A colleague hasn't used his subs for many a year, cos they don't go in his car, and his moving heads have never yet been used in anger! Lunacy, in my book.
Whatever we use, however old and tatty, should be
"fit for purpose ". Cars are for carrying people, vans for cargo. MPVs and Crew Cabs are the acceptable crossover. Simples.
Julian, I'm in the same boat as you, vehicle wise.
I'd say that if it's clean, not too rusty, and reliable, that's the baseline.