My SIL and BIL's 1997 Coachmen 5er has understep storage...so we know someone was thinking of it even back then. Our new (to us) Sandpiper 345RET doesn't have it...but my DH will more than likely modify that soon and maybe even install a small safe...but in my opinion our 5er has a lot of storage.
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2008 Cardinal 30RKLE 5th wheel sold
2006 Rockwood 2607, 2001 Traillite
55 nights 2009, 53 for 2010
44 for 2011, 38 for 2012, 35 for 2013, 51 for 2014