Hmm... already commented on that LOVELY mare of yours in your intro post. One of my fav colors (she appears to be a silver bay, but could be a chestnut) and a great, drafty type build for doing all the things I like doing.
I just about died laughing when you stated you'd gotten a whole lot of stuff (& double no less) from TSC. Must be very different than ours!! Ours has very little supplies/equipment for horses at all and NONE that would work for small minis. Welll.... let me rephrase that - basic health care is the same. If there isn't a local feed store that has mini sized equipment there are several specialized mini tack companies on line that have adverts right here on the forum. I have links to a few others on our website as well.
AS to harness - well you do this - single driving to a cart - (the orange worn by Stuffy is hand made pleasure harness made by braiding recycled haystring from large round baled hay; the black worn by Flower is betathane pleasure harness with a shaped breast collar)
and this - pulling tubs of manure to the compost heap at the back of the property -
pulling the sawed off chunks of the tree that fell next to the drive way up to the burn/bonfire pile for the next "PAR-TAY". This is Bell & Cassie wearing biothane farm spot harness with collars and hames.
And this - close up of Koalah & Bit in a Christmas Parade with our 1/2 ton geared pony wagon. They are wearing biothane farm spot harness with collars and hames.
and did someone mention farm work?? This pair of 40" shetland mares can't pull this full size (meant for REAL Draft Horses) disk all day long, but they did show they could do a full row in deep going and surprised everyone at the Plow Day with their ease of handling (while pulling my 'not lite hiney", too). No I didn't keep them in the field long and Yes, they were tired when we completed our full row. But they weren't tired enough to sustain injuries, they were quite happy to "receive" guests/visitors at our trailer after their demo, and they didn't become "sour"... O, and also most people think of these girls as OLD. In this pic, they would have been 19 & 20 years of age. Now they are 24 & 25 - still pulling carts, wagons and farm equipment. Back to TSC - this pic was taken at a Plow Day function 3 hours from our home while a tornado was flattening the TSC just 17 miles from our house..
Took several years for the TSC to be rebuilt and sadly, it's not the same.
Welcome to the Forum. THERE are lots of things you can do with minis and small ponies!! LOVE THEM ALL. Easier to haul... all their stuff....