Robust Hardware!
From the DEC "Small Computer Handbook (1973), pg 1-23 "Some of the most frequent problems in initial installation of a computer are caused by the vibration and rough handling during shipment. To combat these problems, DEC has devised a test that is even rougher than your local transportation company. The 8/E is raised approximately 3 feet above the lower platform and then dropped hard. The test is calculated to place the various components in the 8/E under a 20G force. A second test is performed with the 8/E in a vertical position (panel up) with a 16G impact force." Try that with your VIC-20 (or P-III).