Hi Thriftmaster,
I haven't seen reproduction under bed tanks for our truck, maybe someone else will chime in with a resource. There are used ones that pop up from time to time but you don't really know what condition they are in until you take a close look. One currently available here:
GAs Tank Something like that could be a gamble but who knows? You could hang something suitable and safe down there while you wait for the right tank to become available. I am interested in what others have for sources also.
