I'd love a horse float! I'd even give people lifts with it! But then I would need a car to pull it, and start getting more than $200 a week to afford to buy both! I'm okay with bribing friends :) But seriously, I keep my horse at a private farm and only one/two other people there ride, and not that regularly, and they both have floats. I do talk to them when I see them. I'd love to live in such a horsey place like you with tack auctions! Actually probably not...I've been to one tack auction ever and I bought a useless saddle!
I grew up in a place with about 400,000, and have lived in bigger places since then, so this seems much smaller, especially with the next large city being 6 hours away.
But I am going to try your ideas. There is apparently an adult dressage club, I don't know what they'll think of my little stocky pony with all their warmbloods, but I might give it a go.