Nice web site.
The only error is Monroe's omission in Dodge 1973-1963 listing not showing the M400. I have a D22C, which is a 1972 Dodge M400 chassis and takes the longer 555013 front shocks with 11" of travel (my RV had the original Dodge MAECO #3633745 shocks). The next year ('73) the shocks had a shorter 9.5" of travel.
Thanks again,
John