AHRMG

When you approach the yard owners with a proposal,try to do it along the lines of something that might be beneficial for them,working with you.,
As for extra security on your bike-
fairly cheap and effective way,would be to get some clear fishing line attatched to a B....y LOUD rape alarm-
You could set it up to sound-
#1. when bike is moved.,
#2. stretch line across like a trip-wire.