Positaps are great ( or is it air-kool? 
)
I've used them on many trailers and dunebuggys with great success. Vibration? Would breaking one in half from too many hard landings count? A old VW bus I put 400,000 miles on maybe?
They do kinda limit the leads that can be added compared to some wagos. I never found a good supplier and have only seen two sizes at autoparts stores that I recall, but those sizes would be ok for most of our applications.
