Just get a cheap one for now. You can get a heavy-duty padlock from Lowes or Home Depot later if you find you are using the cheap one more than once per year.
whichever lock you use, make sure you dont lose the key. dont ask me how i learned that one. not one of my brightest trucker moments
None of them are unpickable, thats just an advertising ploy. Brinks and master are the easiest to pick.
With the protec 2 I don't believe it has been picked. Regardless. It's not pickable with a ziptie like a masterlock.
I always carry my 48" boltcutter, and a die grinder. Actually really do and have for years. Not for breaking into trailers, but they work on gate locks as well.
Youtube check out the lockpicking lawyer, most of these locks are scams, buy a cost effective lock. Some are definately easier than other, most you don't even need picks for you can open them with a soda can.
picked 6 months ago by Mr.Locksmith, not the average driver of course. average driver just cut the hasp.