Originally Posted by MINIATURE SHETLANDS
Stuff that stays in the trailer: trailer jack, spare tire, tire tool, fix a flat, roadside emergency kit, spare halters, lead rope, first aid kit (human and horse) and horse treats.
You beat me to it I was going to say the fix a flat and first aid stuff is first on my list too. I carry one of those trailer ramp things. Haven't had to use it yet but I'm sure I'll be glad I have it comes the time.
I also leave all my insurance stuff, coggins and health certificates in there. The glove box of your truck is good enough if you don't have a place in your trailer. I also carry an ICE (in case of emergency) list in my glove box with phone #'s of who to contact should I be incapacitated.