we got two older trailers with single pod brakes on them still, ones an old oil field tanker and the other is a 50' flat bed, how much work is it to switch it over to double pod brakes to be able to safety it? I live in sask if that makes any difference.
Unless they have recently changed the rules, there is no reason to change them over. Single pots are only different in operating when parked and the air supply is removed from the emergency line. Instead of springs applying the "park" brake, it is done with air pressure from the tanks. Yes when the air leaks off the brakes will release.
I believe it is law that older trucks with that system, do require maxies, double pots, or spring applied park brake on at least one rear axle.
I have several trailers with single pots, there is a name for the system, escapes me at the moment and even my KW still has single pots on the rear axle, and like I said unless something has just changed, all are still legal
Personally I prefer them on trailers I don't use very often. Makes it so easy to stuff a converter under them to pull them with a tractor if needed with out having to cage the springs to release the brakes.
Of course all the other rules apply, s cam rotation, clevis pins, ect.