We didn't like the uncomfortable dinette and wanted comfortable chairs. So we removed the dinette and replaced it with comfy swivel rocking recliners. Sometimes, you can modify your existing trailer.
We have a 60 gallon fresh water tank, 40 gallon gray tank and 40 gallon black tank. The gray tank always fills up first. If I could have anything I wanted in another trailer it would be a combined tank for gray and black. If the fresh water tank is 60 gallons, then the combined holding tank would be 60 gallons. I wonder why the gray and black are always separate? I always dump both in the same sewer line.