And large water troughs might be too big for minis. I had a big water trough from when I had biggie horses and I sold it and I use buckets now because they drink better when the water is fresh. Minis need plenty of fresh clean water so they drink good or they colic or impact from being too dry. I use heated bucket in the winter because I HATE breaking ice. I used to use a submerged water heater to keep the trough thawed but one boy I had would take it out of the tank by the cord. He also "bobbed for apples" and would pull the plug and let out all the water and then bang and put his foot in the trough and dirty it all up when it was empty and he wanted water..
I love my minis, I enjoy having them in my back yard, I visit them all day long and they are so tame and sweet and well behaved because they are handled so much. My farrier says that so many minis are spoiled rotten pasture ornaments and are brats to work on,,, so much so, that my horses are the only ones he does in his practice because mine are so well behaved and mannerly. It was a nice compliment I treasure. I treat my minis like biggies, I expect the same amount of cooperation and respect and my vets love my boys too because they are so easy to handle.
I bet you can find someone to share and do miniature horses with you and you two can take turns with the care. Miniature horses are very rewarding. I love them, they are addictive. I think you can find a way to handle and care for them every day. If you have a small herd, just remember this...handling and care takes time.. even brushing and bathing and feeding is multiplied by how many you have. I discovered that I simply could not handle three. I tried because my reasoning was that if I was cart driving one, the other would have a "buddy" and wouldn't run the fence and go crazy when his buddy left. Instead, I found that I just didn't have enough time to deal with three and all were feeling the pinch of my inability to properly care for three. Also with three, one was always left out.. two against one scenario. Now with my two boys, I have time to bathe, brush manes and tails, check feet, do fly spray, feed and exercise. When one of these boys is gone, I will shop for one more and keep my number to two. I learned that one horse doesn't work at all for me, he was so lonely, so for my situation here, two is my magic number. I tried three horses two different times and each time, had to make the tough decision to find another home for one. I also tried one horse, and I missed my boy so much and was so happy that I could get him back.
anyway... rambling, but hoping to give you information to relate to and not seem like somebody who is lecturing, but rather giving you first hand information I have experienced myself.
take care.