when i worked for a multi-line motorcycle dealership eveyr manufacturer had various programs, incentives, deals, etc.
I know most about yamaha - if you wanted the hot selling bike/quad you had to sell $X volume, and i you'd have to take 2 slow selling models to every 1 hot item.
They would run seasonal ordering programs - if you ordered enough inventory (dollars/units) you'd get free flooring on everything, or on some models, etc. Or you'd get credit on parts orders, or extra advertising co-op dollars.
So we'd order 2 grizzly's and have to take 4 timberwolves. We' be willing to sell the timberwolves cheap and get full retail on the grizzly (it was the hot new quad that year).
So yeah, it can be a regional thing, a seasonal thing, a specific dealer thing, a marketing thing, etc. If a kioti dealer has a lot of CK26's and the kubota dealer has nothing comparable but a lot of L3910's then everyone is happy. If they both have similar machines (overstocked) then one may dump them cheap - or perhaps advertize a killer deal and up-sell a buyer.
The dealer I bought from was pushing via marketing CK3510s. He had CS and CK on the floor, 25 and 35's in stock, cab and not - didn't see any 40's. The diff in price from 25 to 35 ws $1800..from 35 to 40 was $3000...not worth it for 5hp...is that a REAL difference? Seemed awfully hihg to me - BUT - if he had to order one in special vs having half a dozen 35's he needed to move from inventory...sure, i can see that.
Dealers WILL trade to other dealers - BUT - they 'lose' the profit on the retail sale of that unit...hot selling units won't go to other dealers at wholesale prices...plus you have the transportation cost to get it to your dealership.