Our 27DBK has rear bunks. We could never use the upper bunk because the ladder was straight up, and our boys couldn't make the transition.
The younger boy still goes with us, but at 13 he's nearly 6ft, and the lower bunk no longer had enough headroom.
I pulled the bunk, shortened it, raised it and reinstalled as a shelf.
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2018 Salem 27DBK/2010 Dodge Ram 1500 Laramie
Days past:1996 Coachman Capri-Ruby Ed. 27DS
2004 Ram Quad 1500
1995 GMC Yukon Sport
1986 Jayco1016PUP
Days Camped:'13-10 '14-20 '15-6 '16-9 '17-14 '18-3 '19-12 '20-14 '21-12
Great mod but that must have hurt on a new trailer. When we went shopping for a trailer we looked around at the bunks and all of our kids are to be over 6' and our 12 year old at 5'3" laid down in the bunk and not much more room left. That is why we went with a Roo 233S with 3 queen beds.