1. Not quite as sturdy of a container as the buckets. Thinner plastic. Otherwise just a smaller diameter opening and gamma seal lid. I've only used the smaller one for storage in the boat. I haven't given it much rough use to see how it holds up. The buckets have held up very well in many years of use.
2. We don't have a second lid with an RV hose. We either use a scat machine (Idaho & Oregon) or do the RV dump station pour down the drain and rinse method. Not my favorite method, and not for the squeamish, but not that bad really. An RV hose set-up would be nice. That's kind of why I started this thread. To find an alternative when a scat machine isn't available (Utah).