from what i know, the seals are no different than the variety of "D" seals in the Automotive Industry.
an auto body supply store might have some to choose from.
or you can contact Coachmen parts dept.
but Coachmen makes two different brands of hybrids, so you'd need to know which one.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC