Hose Saver Elbows are inexpensive and useful for connecting to water connections, preventing wear and tear on plastic components, and providing room for accessories.
Drill adapters can be used to raise and lower scissor jacks in seconds, but should only be used to stabilize the jacks and not for lifting.
Bubble level gauges can help ensure your RV is level before unhitching, allowing you to find the most level spot and start setting up your campsite.