I don't know about Oliver, Eggcamper, or anyone else out there.
both of these do not use distributors, just referrals. BigFoot and Trillium are the only 2 I'm aware of that may use distributors. But I also think they sell their products to the distributors, unlike automobiles where they are on display and on loan to the dealer vs a distributor until sold. Most automobile dealers use "Floor Plan" loans to finance their inventory, normally via the manufacturer. There is a interest rate charged and incentives on the oldest model in stock, normally done at the end of a month to meet quotas.
never in doubt, often wrong