I think those are the only two currently available. FWIW, both are excellent bumpers, but the Calmini is limited to just tire carrying duty. If I were buying I'd go with the Skid Row for the options and because I like their latching mechanism much better than the Calmini. With either one, I'd be sure to buy the frame stiffeners from Skid Row.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy