Question about loading attractions on crutches

My husband will be on crutches due to a broken ankle for our week after Thanksgiving trip. We are renting an ECV because he will still be in a boot, but not yet able to put weight on it. For rides where he is required to transfer to the ride vehicle, will he be able to use his crutches and then leave them with a CM to collect when unloading? How does this work? Anyone with experience know of rides that may be especially difficult to navigate when using crutches? Thanks for any advice!