You could maybe do a deal with a bigger outfit to contribute some capital for some gear and get a cut when they rent it? But for having your own rental company

You could maybe do a deal with a bigger outfit to contribute some capital for some gear and get a cut when they rent it? But for having your own rental company (for the kind of people you want to rent to), you need to invest in lot of gear because they want to hire as much as possible from as few places as possible. Hundreds of thousands of dollars in cameras, accessories, lenses (especially important), lights, rigging gear etc.