All the manufacturers have tried this in the past and most lived to regret it.
Menards in WI I think was set up this way for LInde.
Parkway Systems in San Antonio was owned by grocer HEB, they finally spun out to Darr this year I think.
Kenco Logistics owns Kenco Toyotalift, they used to have a bunch more branches, now just down to a few so you kind of see how Toyota felt about that.
I think TCM did it a few times too.
Manufacturers don't just sign people up and say boom you're a dealer. They want to understand the ownership structure, what the plan is to support the brand, even what the succession plan is if the owner dies (they want that in writing). So even if the thought is the just keep the company "as-is" with an upstream owner, any manufacturer will really want to understand what the game plan for growing market share in that territory is. Do yourself a favor and just grind on the manufacturers and dealers to get better prices. Run from this dealership idea.