Good question!Ok what is a trailer boot??
Do a Googlex® search for "wheel boot" or "tire boot", I saw at least one for less than $100.00That's what Im looking for Thanks. $9500 Trailer or $170 security boot, pretty easy answer.
My fear would be how to get it off if it froze up? I have yet to find a padlock that does not freeze up when left in the elements.