Many municipalities do not allow anyone to live in an RV under many circumstances. IF his is a case of allowing you to violate ANY law in his community then yes...you are being unreasonable. If it's just his "whim" then probably not. If it IS legal for you to stay in the RV then you might try renegotiating the contract and allow him to spend a DAY in the RV. If a system works during the day it will also work at night. Might make the issue of "trust" easier to swallow and he would likely want to add something else to your contract that says you can back away for a "just" reason, not just your whim.
Good luck / Skip