I use a job site toolbox on the flatbed of my truck to keep tools out of the weather but sometimes need to leave the box in the shop or mount it on a gooseneck trailer. I don't really want to weld nuts to the bed and bolt it down everytime. Any suggestions for a type of pin that would be quick release? Lockable would be fine but it really just needs to hold a 300-500 pound toolbox from falling off in traffic