The first two I ordered required $0 deposit. For my most recent 2019 order, dealer requested $2k and counter-offered $1k.
If you order unusual options, I would imagine the dealer might get nervous about being stuck with an oddball unit.
For instance, Window Prep Package F03 with W94 (cutouts for windows all-around but no glass and temporary plastic wrap to cover cutouts in transit). I saw two 2018's ordered with this option for sale at dealers after customers backed-out and left the dealer holding a van requiring eight aftermarket windows.