With a $400 bouncy house, you can make $150-200 a gig. Renting out bouncy houses offers an excellent opportunity for passive income through a business model that capitalizes on the demand for kid-friendly entertainment.
There are people renting out fridges to caterers doing on-site events. Deliver it before the event, pick it up after.
Renting out directional drills can be a lucrative endeavor, offering a niche but high-value opportunity in the equipment rental business.