My security ideas are as follows:
1. Max coupler installed. When I leave the unit unattended, the coupler will be removed.
You thoughts?
My reply is based for the hitch security system.
I too am in the same situation as you right now. We need to protect our investments and this is actually why i suggest not using the max coupler for a lock. Sure it will deter most. But say i pass up your camp when you aren't there and i also have the max coupler. I can easily steal your trailer with no problem if i have the vehicle side of the coupler. Not saying i would do such a thing but people now days never stop to surprise me.
What i will most likely do and i suggest you look into doing is fabricating some sort of hitch lock that will slide over your trailer tongue. Maybe the first 12-14 inches. Something that will allow you to use a trailer pin lock but make it difficult for people to tamper with the lock as well
Here is something i drew up earlier today. Super rough drawing but it works. I plan to make something very similar to this. Obviously it wont look as thick as his either but i will definitely work as a visual deterrent from keeping people to make off with your trailer.
So this idea is something i based off of this front bumper that i fabricated for my 89 4Runner.
Basically what i wanted to do was to protect my winch from being stolen off my front bumper since all you need to remove it is to remove the 4 bolts which hold it in place here:
And since this is a trail-gear front winch plate that i used as the bumpers platform to create it it means i have a hitch receiver hat somebody could slide a hitch into o tow my vehicle away. (I may be a bit too paranoid but, we have to protect our investment right?)
So i cut some 1/4" tube hat would fit into my hitch receiever. While using my existing U-Hual trailer ball hitch as a template for how many inches it should be made. and where to make the hole for the pin.
Test fitment and tracing out where the hole needs to be made for the pin
I decided to add a plate onto the front of that hitch to cover the front portion of the hitch. This not only worked as a security plate. But also worked as a license plate holder.
Using a 3/4" hole saw i made the hole for the slide in tube.
All welded together
I also bought a Hitch pin lock to use
But i found the 4 bolts were still able to be tampered with. so i had to add a cover so they could not be removed so i used 3/16" plate strips to cover the bolts
Problem solved
Here you can kinda see that there is only about 4-5" on each side to stick my hands in under the bumper to remove the hitch pin lock.. It's a pain in he butt already to remove that alone. It will be more then enough to deter thieves from sticking tools in there to attempt to remove the winch.
I'm sorry to have somewhat hijacked your thread in trying to explain this idea but if i could explain myself well and give you ideas to keep your trailer safe then this LONG RANT was all well worth it. I hope this gave you some sort of idea in what to create for the hitch. Soon i will be creating the hitch lock in the first picture so if you are interested to see how i fabricate it you can feel free to check my trailer build out.
We need to protect our investments. Mine has taken almost 2 whole years to get to this point. And i don't want some scum bag to steal it because of something i could have done to make more tamperproof
Anyway Rant off. I apologize for making such a long post. But i really do hope it helped.