OSHA says all changes to a truck must be approved by the manufacture and/or their authorized agents - there are beaucoup Crown company owned stores & those branch managers aren't going to buck the "head shed" folks in New Bremen

Crown Reach & OP , Walkie Stackers units are welded on - the only unit where a mast swap "might" be physical possible are electric counterbalanced sit down rider balanced style units, stand up counterbalanced RC, walkie counterbalanced stackers and the ICE C-5 line. But if big Daddy Crown says no swaps allowed then you are screwed.

With all that being said the likely hood of any real need to swag mast by an authorized Crown lift truck dealer is minuscule.