Vics, I've been able to find about three different autotransformers. Besides Hughes (one 10% step), there's Frank's (an 8% and 16% step but more expensive than Hughes), and one other brand that I don't remember.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS