There has been some discussion in an unrelated thread about if rolling an amplifier with casters across cement could harm the amplifier? In my case, I was taking my Twin with JBL speakers (approx. 120 lbs) to my amp guy who happens to have spent decades with and retired from Fender. I was rolling the amp from my van to the shop across the cement sidewalk before that amp tech came running out and lectured me against doing such a thing. His claim was that rolling an amp across cement is a sure-fire way to destroy the amp as the vibrations transfer straight to sensitive components (reverb wire, solder points, etc.). His belief was that casters were a bad idea all around and that amps should either be carried or else placed on a padded cart to isolate from vibrations. I trust the guy based on his background, but can find nothing out there to really support his position. Anyone who owns heavy amps like a Twin likely view casters as a positive, so it would be good to hear the opinions from our amp tech gurus found on this site. Is it safe to roll across cement or is it really just for rolling across a studio floor where there would be far less vibration?