Personally, I was more willing to buy a property in a neighborhood with livestock, trailers, sheds, and the relative stuff that came with horses. I offered the sellers full price after taking a good look around.
I won't do that in a restrictive HOA -- because I can't do what I like with my own property.
There are 14 other property owners in my area. Nobody cares what color you paint your house. Everybody keeps their yards under control. It's fine if the tomatoes are out to the sidewalk- bonus snacks for anybody walking! Horses and goats on the loose are a problem-- they get closed in the nearest pasture, and the owners are called. Loose dogs get a ride to their homes.
Trailers of any description aren't an issue. At all. One neighbor has a gorgeous horse trailer + human compartment that rivals any 5th wheel I've seen. Another runs a landscaping company from his home.
It's all good.