I have been ground driving my QH mare, and I think we're ready for a harness. I plan on doing a little ski jorring this winter, and the snow crept up on me sooner than I had anticipated. lol. (usually we don't get anything good until after Christmas!) So, I am looking for a harness for her. I have seen several different kinds, and I plan to put her in front of a cart or wagon or sleigh down the road, so the harness has to be a good one. Any info or input is appreciated. Biothane v. leather? Pricing on new & used? what to look for in used? Noob with the driving, so... help me here.