The 2.5 gal version is the one I have.  It fits just perfect under the end
of the bed when the bed is down, the 5 gal version won't.  But then I just
acquired the high rise hinges for the bed, not in yet, but when they are may
explore the higher capacity unit.

On 5/23/06, mark drillock <drillock@earthlink.net> wrote:
>
> Get the SeaLand Sanipottie with the 5 gallon holding tank. The standard
> model is only 2.5 gal or so and you get more than twice the true
> capacity with the larger tank.
>
>