They have not always been standard, though I don't know why. I do completely agree with Jagiven, they do seem to work better with a piece of plywood or something similar under them.
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2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control
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