Great question. Obviously, I think part of the answer depends on how one will use their RV. We would carry more spare parts if we did more boondocking or remote camping, for instance. While we haven't been doing this very long, relatively speaking, we haven't found the need for very many spare parts since 1) it's impossible to predict all possible issues we might might encounter and 2) there is usually a resource nearby (either parts or service) that can provide the solution.
That being said, as far as parts (non-tools or supplies) we do carry:
- spare fuses
- a small nut/bolt/screw assortment
- a small electrical connector assortment
- batteries
- assorted wire ties
- super glue and liquid tape
- Eternabond tape and heavy duty duct tape
- spare fresh water hose (flat, roll up type)
- spare water pressure regulator (some campgrounds have extreme pressures)
We have used each of the above at one time or other and they take up little room to store. Even though the macerator discharge nozzle fits, I think 4, dump station inlet sizes including a garden hose extension, we have found that ours does not fit those available at a number of campgrounds. In these cases we've used a large rock, or more often we use the heavy duty duct tape, which works well. Apparently, the newer Sanicon Turbo nozzle fits 6 different sizes rather than 4, so this may no longer be an issue.
Lastly, we do carry a length of 3" sewer hose (with connector) as well as a spare Sanicon hose. We had pinholes appear in our Sanicon hose, made emergency repairs with liquid tape and duct tape (which barely lasted until we received a new hose) and decided there isn't a downside to always having a spare hose.
- Mike