If you really want to get the best price, I don't like to show my "Cards" to everyone in the game. I would rather not disclose any information to the dealers who you might be talking with.
The other dealerships might feel that one dealer is not playing fair, and complain to the manufacture, and get that dealership in some sort of trouble.
When I worked for a City, they would purchase several pickup trucks a year, along with about 4 large 10 yard garbage trucks. (their fleet was large enough that replacing 4 trash trucks a year, and all of them would not be replaced in 10 years).
Sometimes they would advertize in the newspaper for requests to bid on something, and have a date to pick up the vehicle specs, and that package would give details on the vehicles to bid on. It might include something like 4 police cars, 5 pickups, and other cars that can be purchased from a local car dealer. They would have to specify when they expected delivery, and how the winning dealer would get paid for any vehicles they bid on and where the lower bidder.
We would not give a deposit, but the dealership was signing a purchase order, and knew we where not going to back out of the contract once it was signed. If they where the low bidder on say 4 police cars, but not on the pickup trucks, we could accept the cars from them, and pickups from another dealer. Then the City would issue a $80,000 check when the cars arrived and where the correct color, and had the required options.
Other times they could accept a "Fax Bid" where the City contacted several dealerships. THey might specify a pickup less than 1 year old and less than 15,000 miles. Any dealership could place a bid, and when opened, they can accept any or all of the bids, depending on the City's needs. It was much quicker, and usually was started when a local dealership called to say "We have this very nice year old pickup with 9,000 miles, turned in on a lease return" or something. We would need to act quickly, and sometimes could purchase a vehicle at a $10,000 savings off the brand new price.
So you can ask dealerships to place a fax bid, or mail in bid, with all bids to be opened at a certain time. We HAD to have a open bid process, and open the bids in a conference room that anyone could attend, sometimes the local dealers would show up to see what the lowest bids are, and see how low they must go to gain our business.
You might be able to get a better price if you acted like a corporation! You can incorporate in most states for only a few dollars. Then it looks like 'RKW Leasing" and then you might get more bidders. When they call, act like you have no concern who will actually own the vehicle, just it will be sold to another client. Just that you have a client who wants a certain RV with certain options. Always act like you need to contact the client. So if they say "We have everything on the option list plus built in dishwasher, yet instead of the brown, it is black and white painted exterior". You must act distant, and not scream "It will work out great!". But say something like "I will ask the clients and see what they have to say about that".
When I was in air conditioning school, in Phoenix AZ in 1983, I wanted to join Price club. But you had to have a business license back then, so I rode my bicycle down to City Hall, opened a business, and got the tax license, and was able to advertize for clients, tell them I worked at "Golden Aire". It only cost about $25 back then, and I was only 18 years old. I got my Price Club Card too!
Hopefully you can get the dealerships to work with you. I think it will all work out in the end. My sister used to purchase cars for a real leasing company (well 3 of them). She would buy 10 - 25 cars a week. She got real good at dealing with the fleet sellers, who knew that she was going yo buy more often than not buy.
Back in 1985, Toyota's where consistently selling at MSRP or higher costs, while she was able to buy Toyota's at MSRP or $500 to $1,000 less than MSRP. The company could sell the cars with 50 - 250 miles on them in Sacramento area at $2,000 - $2,500 more than MSRP! This would cover the costs to truck the cars from LA to Sacramento.
Fred.