I can only speak on #3 since I’ve hand the most experience here. Drive traffic to a specific landing page via a QR code on the flyer or just a domain URL. Obviously you may need to use some click bait like, “Go here for a free guide on selling your mobile home.” or whatever.
But if you can get them to your site and that specific page, you’ve got some silver. Then can see which parks based on geolocation (in GA), converted the highest and concentrate a larger part of your revenue to those area’s next time.
Now if you have a sign up to receive our free guide, or similar, you’ve not only got silver but gold. Why, because now you can retarget them with ad’s wherever they are at for, a week or two after. Works wonders :).