We have a long cable we run through our equipment. It is on it all the time, whether the trailer is sitting for lunch or we are at a house mowing, it's always on and locked. It is locked to the front of the trailer, then goes through the two gas cans, trimmer, blower, trim mower and then is locked again at the back of the trailer. If we need a gas can we unlock the front, the blower we unlock the back.
We are a much smaller operation than most on here, our trailer has a Honda Commercial push, Stihl Kombi trimmer, Stihl blower and two gas cans. The John Deere stand-on is not locked up.
The trailer sits in a locked garage overnight.