There's quite a bit in the article linked by OH-O that I don't buy into.
All draught horses must be introduced to shaft work at some point, but the idea that one particular type of vehicle, given a specific name, was employed doesn't make much sense to me. I think people would just have used what was to hand, be it brake, wagonette, landau, side car, dog cart, trap or whatever.
I nearly fell over laughing when I read that a shooting brake was just an ordinary wagon pressed into service; the ones I've seen and been involved with are all high examples of the carriage makers art, beautifully built and designed for the job.
Garrons are more a type than a specific breed; many are outcrosses of small but tough traditional hill breeds with draught horses; sagacious beasts they are.
The pic of Ms Garron is truly terrifying, but at the same time causes one to wonder if she could carry a twenty stone red stag off the hill unaided; I'd back her to do it. I bet The Donald wouldn't make any snide remarks about
her womanly goings on, she'd render him limb from limb PMT notwithstanding.
Eug