Quoted By:
Cheapest bike you should consider: An entry level bike from a reputable seller costs somewhere in the neighborhood of 300, US. Used can be found for significantly less. Avoid anything sold at walmart.
Zero experience using them personally. My last soigneur's husband used one. Dog needs to be trained well enough to take verbal commands, even around untermensh and road ragers.
He had a tow leash type, rather than a spring type, with a harness. No idea if it would work with multiple dogs, or the possible complications.
Pic vaugely related.