We are a commune of inquiring, skeptical, politically centrist, capitalist, anglophile, traditionalist New England Yankee humans, humanoids, and animals with many interests beyond and above politics. Each of us has had a high-school education (or GED), but all had ADD so didn't pay attention very well, especially the dogs. Each one of us does "try my best to be just like I am," and none of us enjoys working for others, including for Maggie, from whom we receive neither a nickel nor a dime. Freedom from nags, cranks, government, do-gooders, control-freaks and idiots is all that we ask for.
Not that I know this for sure, but I believe that "cracks" refers to the hoof problem horses have and running on soft surfaces like grass or snow. I've seen the term "pacing cracks" which refers to the same.
Just a guess you understand - I'm not at all sure about that.
Hey all you cross country skiers out there--just a thought: you know how skinny those runners (blades) are on those old fashioned buggies? Welll, how about this? did they have to line up those runners with the tracks in the snow the same way cross country skiers do?
"Cracking on" means to move quickly or speed up, especially in bad surroundings. More British slang than American, maybe equivalent to American expression "power through it"? Think it originally had something to do with putting on more sails, rather than less, on a ship in a storm.