If you ever find yourself in Portland, OR, you might want to stop by Zenger Farm and check out the sweetest chicken coop on two wheels. Last year, Patrick Barber, of the Eastside Egg Co-operative, contacted us for some tough, high-float wheels to go on a mobile home for the co-op's peep of free-range laying hens. The concept intriqued us enough to throw down a pair of hubs, Large Marge rims, and Endomorph tires for the new coop. Sacha White, of Vanilla Cycles, fabricated the sturdy forks. The assembly looks bombproof. Judging by the smiles on the chickens' faces, they…