Moving anything big and awkward can cause problems. You certainly can get away with moving a DLP but like mes444 I don't mess with mine. My son-in-law wanted to test my Samsung in his media room but I declined. We'd have to carry it up the stairs, out to the pickup then into his house then bring it back. Just too many chances for something to go wrong. I've moved the stand out to change wires on my AVS but that's it, the TV is married to that stand.
Odds are that a high percentage of problem DLPs right out of the box were damaged in shipping.