I am thinking you could flip a switch, which lowers a skirt and runs the fan in reverse : instant hovercraft mode for crossing a river, or even just deep mud. Y

I am thinking you could flip a switch, which lowers a skirt and runs the fan in reverse : instant hovercraft mode for crossing a river, or even just deep mud. You'd need a steerable outlet jet on the back for propulsion. Then once on firm ground, flip it and go back to racecar mode.