It's possible that your front storage area is large enough to hold one (14"Hx20"Dx30"W), but there are a few concerns about installing it there.
1) Using up that much storage space.
2) Having it installed right under your bed.
3) Sealing the compartment between the genny and the RV interior.
4) Providing fresh air inlet for the genny.
5) Routing the exhaust outside.
6) Consuming 200# of available cargo capacity.
None of these things are a huge deal, but they have to be considered.
Also the 4000 unit becomes a 3600 when fueled by LP.
My biggest concern would be #2. Would I really want the beast running right under the bed. I'm not sure vibration would be an issue, because that can be mitigated pretty easily, but the noise might be a concern.
Having said that, I've spent many nights sleeping right over a running genny and engine on a shrimp boat that was a lot louder than those Onan's are!
Of course I was a lot younger too.