hybrids, like all TT's, don't have the available space like a 5th wheel or MH have.
i have seen a couple of hybrid owners add a large shallow pullout drawer under the frame.
other than that, you don't have much you can modify without hitting something.
if you don't care about the frame's warranty, you could have a hitch welded and braced to the frame on the back, so you could use a cargo tray.
but this would really change your tongue weight and possibly cause control issues.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC