If your going to detour the non professional, just go with a big thick chain or two and put it around the frame and let it be visible so they will say,,, too thick I cant cut it or someone will see me if Im going to cut that thick chain.
Remember, all of these accessories listed on the sites assume that these are NICE ROBBERS that are neat and will go through all the accessories you have at your location and hope that someone will see them and call the cops before they actually get away. WRONG.
The big thing for the robbers is to get it and get out as soon as possible. Remember the movie GONE IN 60 SECONDS? Yep, thats all they will spend at your trailer and its gone. The visible thick chain should do it all along with a fake camera nearby and the signage.
The pros again will laugh at all this stuff cuz if you put on these accessories, they just pull up and will grab the safety chains and let the trailer go hanging loose on the chains until they can cut off the parts you put on.
Put up a Video Surveillance sign.