I had the same problem where I used to live and parked my trailer in the back yard.
Once I had a party and moved it back out front and a local cop gave me a hard time. I told him if he wanted to harass me he was welcome to do so but the law said the trailer couldn't be parked for more than 24 hours and I was prepared to drive it around the block once a day until the party was over if he cared to check.
He left me alone for a few days until my event was over.
Doesn't solve you problem but I wanted you to know you are not alone.
Try a U store it type facility if you can't park in the back yard.
Kyle Kaulback '56 Mark VI '71 Type61mX '71 Type69 FF '71 Type 69 F2 '77 Super 907 '91 M100 Elan '91 Omega LotusSport 110 '05 Elise(custodian) '13 Evora S