I had the dimensions and it looks like it might just squeak in there. I was hoping for the extra water and black tank capacity. You are referring to the open compartment on the very tail end, correct?fish more said:It would not fit in my Hawk, measure your space, go on Thetford's website, it has the dimensions of the 345. I use the 135 Thetford, it fits under the rollover end compartment