thanks for the reply

it's parked on a flat spot... pretty level...
yeah, I thought about water in there just creeping up to the front,
but there's been so much - I'm guessing the front side window(s)
are the culprit

I've bought some window sealant and looked at them, but it's not
obvious where I ...

ditto the standing water under the top bunk.... after taking it apart I
can see it's not the first time... bought her in July '08

what I can't figure out is WHERE it's coming in - I had my entire
(and I mean entire down to the tires) covered with a tarp this winter
and still.... water.... hmmm a ...