Re: bucking small logs, I was first thinking along the lines of your manual tie-strap idea, but what would be great is if I could somehow modify a log trailer that has grapple and winch, to also include a sacrificial/replaceable wooden bed (chainsaw can kiss it ever now and then without any dramas) and some sort of tie strapping on each set of log support extensions that somehow maintains pressure (tightens up automatically) as the logs move and settle as they are being bucked. I hope that is easy enough to understand.
hydraulics with a float...like on my skidloader
each log support is C-channel instead of tube, and has a small diameter, long throw cylinder in it...attach chain across the logs to corresponding cylinders and set the lever to float...cylinder seal life wouldn't be great though, and all that hose and controls will be spendy.
small atv winches (I think they have a locking clutch) down one side of the trailer would work also...until you nick those taught cables with that monster saw you'd be running
either hydraulics or electronics can be rigged to maintain pressure...I think it would get interesting when they decided they had too much pressure, and decided to release a bit
or
what about a large saw buck (U shaped, not X) that pushed the logs out the back with a large plate. maintain a tight bundle with a garrote of chain that reset before each push, or a large dia grapple...cut billets off the end like an industrial pasta machine (automatic circular or chainsaw)
I dunno man...good discussion.