Practice. Practice. Practice. Driving, maneuvering, getting in, getting out, stretcher/sked-co/tarp/drag drills, blind spot "figuring out", etc... ROLLOVER DRILLS... Some of your guys will be as big or bigger than some of the Soldiers that were moving in and out. Also, since you guys probably deploy CS or similar more often, do the same training in your protective masks. You may find out that the driver and/or TC would benefit from mounted protective kits (IE an M42 system vs. the M40 system). Your team may have to reconfigure their gear to make this usable.
the MRAPs are very unique beasts... This is not a "hop in and drive it" truck. make sure you specifically "license" or at least train the drivers and alternates. this is as much a safety thing as it is a (insurance) liability.