I have a new 289RK and the Bed did not come with the struts for the under bed storage. It is a real pain to open. Did your units come with the struts? My window sticker said it came with them but the dealer told me they did not.
my 2012 289RK did not come with struts I plan to make the box under the bed bigger and add drawers so mattress does not have to be lifted. it is very heavy and I doubt if struts would hold it even double struts.
2012 Dutchman Denali 289RK
2007 Ford F250 Lariat Super Duty
2WD, CC, Power Stroke Diesel