Do you have a valve to dump the waste tank overboard, and if so where is the valve?

ours was a 1998 and we had to suck it out

I dont think so, but I haven't really looked. Should be simple enough to add one though. I'd have to look to see how accessible everything is, but it might be easy enough to install a diverter valve so everything goes overboard before it reaches the tank too.

I'm withdrawing my offer for you to be my neighbor. LOL.

What's the matter, a little waste in the canal never hurt anybody.....

There's a valve at the bottom of the closet that I was thinking might be an overboard dump for the waste tank, but when I open the valve nothing happens.

I'm not sure if anyone has even used the toilet on this thing, certainly no one has while I've owned it. The waste tank has some of that Sealand chemical in it, and it is giving off a little bit of a smell from the toilet. I've pumped the head I few times but I don't think we are getting that last little bit of chemical at the bottom of the tank.

Put some water and bleech in and drive it some, then pump it again and just put some water and the normal toilet treatment in.