I have one mini Shetland at 33.5" tall. I bought him when he was weaned because I loved him. He is now 8 years old and I play about with him, walk him, have him as lead rein sometimes for my friends kids and now I work him in a pack saddle. Look up Journeyman Leather, Shetland and look at their klibbers, that is what I use with hay nets to fill with items. I take my winter fuel (peats and coal) home. e is my best buddy more than anything though.
I also have 6 (7 soon) standard Shetlands. I ride my 40" gelding, yes I'm light enough for him, and will be breaking the others into work too. I've broken in my stallion to work this summer, took to it like a pro.
I also trim their hooves myself, have to, so if you need any advice just pop a pm through.