The Honda Element was discontinued in 2011, so this must be an older Honda we are talking about here.
I'd check, but as I recall, many 2WD Hondas with automatic transmissions could be flat towed provided a special routine is followed to lubricate the transmission. Manual transmissions are normally towable (would check that also). All-wheel-drive or 4WD Hondas may not be, and can not be put on a dolly at all.
For small motorcycle or electric bikes, there are racks or lifts that can haul the bikes/motorcycle off the rear bumper. Depending on bike weight and motorhome cargo capacity, I would think that may be preferable over a trailer -- although may cost more than a small trailer.
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