When boat diving around here (Brazil) we usually don't have time to jump in and don in the water, so that means giant stride 99% of the time. No problem doing it in sidemount: I usually clip tanks to the harness (top and bottom) and loop them with the bungees. Then walk up to the platform, one hand on mask and reg and the other usually holding the camera/GoPro, elbows down to secure tanks and send it.