X17z black tank

It is a smaller tank (22.5 gal). What do you mean it is full after only a weekend? Do you have a poop pyramid under the toilet? and no more will go in? How much water are you putting in the tank? After dumping add at least 10% water (2.5 gallons) back into the tank, every time you flush add a lot of water. The water allows the poop to distribute around the entire tank. It also pushes the Poo down the sewer tube while dumping.

My guess you have a poop pyramid under the toilet. You should get a tank wand (connects to a garden hose) and break it up. I would also add some water or fabric softener to the tank with a lot of water. Both items will help soften old dry poop.
 
Doesn't seem too far off from my experience but obviously subject to how many people are using it and how often. Looks like the 2018 X17Z has a 22.5 gal black tank. Our Starcraft 17SB has a tiny 9 gal black tank and we have to dump pretty much every 18-24 hours during a typical trip. Family of 4, 2 adults and 2 little kids. Full hookup only sites for us as a result.
 
25 gal tank here. It takes two of us 4-5 days to fill black tank. Same size grey tank and we fill it in 2.5 days.
 

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