I have strapped skiis on a Yamaha DT200 to go spring mountaineering. Tail end strapped to the footrests, tip ends tied up behind me at an angle approaching my thigh when riding. I imagine 4 foot spririt levels could be housed in a quiver attached in a similar fashion out of the way on either side of the bike, with maybe a foam rubber cushion on the bike side. For the skiis, the only clearance problem was height vs truck mirrors when splitting traffic, but otherwise everything was behind my body and relatively safe and stable at all speeds.
Kind of like a reverse scabbard (Y'know, Winchester 73 et al).