I have learned to use every trick in the book on any of my bikes that I take off road, otherwise I wind up having to go back searching the trail somewhere to find my damn plate. At the moment my KLR has double nuts on the mounting bolts plus lock washers plus Loctite. If you have lower mounting holes you can tie it on with wire through those in addition.
Last trip I shook the exhaust midpipe bolt loose, but luckily it just fell into the frame and lodged there and I found it when I was giving my bike the daily once-over in camp.