Keith, yes that was at rest.
Even though I was absolutely confident of that, I did exactly what Bob said in his reply - I did a try run. Bolted everything in place, and with a temporary setup using a power supply (a battery could be used), I ran the motor, making sure that the linkages were doing as I expected. No wipers were installed at the time, just in case. It ran well and parked fine.
I figured once I put all of the other stuff (steering column, console, air cond) in the way, if there was a problem with the wiper system, it would be a big bummer to have to go backwards.
Actually every piece that I put back I consider what I could do to test it.