Fluid Truck was founded in Denver in 2016 as Fluid Market, an Uber-for-everything app that allowed users to rent a vast assortment of household items and vehicles will be sold.

An investor in Fluid Truck has accused it of a “corrupt, unlawful and unconscionable scheme” to take more than $11 million from vehicle owners.

Fluid Truck, a startup that was founded to disrupt the commercial vehicle rental industry, has ousted its sibling co-founders — CEO James Eberhard and chief legal counsel Jenifer Snyder — ...