OK, Mrs ERJ and I took the dogs out on the open road. Between the two dogs we logged 3 miles.
Much easier pulling for the dogs on the packed snow rather than through the 8" fluff. I see that 40 pounds per dog will not be much of a challenge once the sled trace is firmed up.
I had between 15-and-20 pounds of ballast in the sled.
And I clearly needed a brake on the down-hill legs. In a few places the snow plow exposed dirt at the top of the crown. Running down the dirt strip worked OK.
Other places it worked better for me to unhitch the dog and pull the sled myself.
So what works best? A bundle of brush? A car tire? Logging chain? A partially filled sandbag? A welcome mat made of tire carcass? Any other suggestions?
Inquiring minds want to know.