But here's the thing: Let's assume the Harley dealership has a staircase up to the front door. While it is indeed possible that someone in a wheelchair might wish to purchase, oh I dunno, a Harley jacket or something from the Harley dealership, would they not be reasonably able to do so if an employee stepped outside to sell it to them?
Given how many handicapped people actually would visit that Harley dealership, versus the cost the dealership would need to pay to add a ramp or what not, it's doubly stupid that the ADA would insist on the ramp being built AND give a fat payday to an ambulance chaser for pointing it out.
As for evacuating the handicapped in an emergency, no building in the country has a wheelchair accessible fire stairwell. The emergency posters on BART all say that wheelchairs should be left behind and their occupants carried. And yet these situations pass muster.