I've used bottle jacks for years,never an issue even in uneven ground..Take the necessary precautions and a bit of common sense and they work just fine..Used the old handi man jacks a ton also but there worthless for truck campers other than as a winch for a short pull...Ideally a floor jack would be the cats meow but who wants to carry one of those around..
I don't know where you guys get flats but I get them in the worst areas it seems where help or even cell service doesn't exist and that's why I keep good tires on my rigs because walking out sux...