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I tend to trust the economists, who mostly say that free trade is a net benefit to the country.3
I couldn't find anything credible to indicate that rigid mounting causes wear or fatigue to the engine itself. Might even be that letting the engine vibrate freely on mounts causes more noise (like the flexible foam edges of a loudspeaker allow the cone to move, creating more movement and noise).1
My neighbor recently called me to diagnose about 20 VAC on a disconnected line. As mcgivor says, it's induced voltage and should be ignored.1
Franklin allows a 5% wire voltage drop running at maximum nameplate amps. Plus, I assume, 5% voltage tolerance in the unloaded supply (or maybe 10%). So 120 * .95 *.95 = 108V is OK. But with the 100 extra feet and probably not at nameplate amps, you may be slightly out of spec.
You could throttle the pump a little to reduce amps.
There are lots of variables to consider, but I'd probably continue on with the existing pump and if it dies, replace it with a similar one. It's < 100Wh/day and not a huge startup surge - don't spend much to optimize it.1