The warranty requires the "Preventive Maintenance" to be performed at a Dometic Authorized Service Center/Dealer at owners expense, "starting at the anniversary of his date of purchase." It's a two year warranty. So you'd only really do this once, because by the time you got to the second anniversary, the warranty would be expired.
I've never bothered. As Splitshaft says, I don't get wrapped around the axle on warranties.
1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10