I did contemplate a launch trolley for mines when taking it away with my caravan.
If I'm a good boy Santa might bring me a 3m air deck as a secondary Sib.
I'll keep it for taking away in my caravan as I already have a bravo 12 v pump and a spare set of launch wheels.
One of the best mods I made to my honwave was the addition of a galvanised lifting bar which is attached to the bow rings with a rope - makes lifting the bow and pushing it along on the transom wheels a doddle.
I stand on the flat bed of the trailer and use the bar to lift and pull bow onto the carpeted bunks.
One its on I use the winch to pull the Sib onto the trailer.
Works for me.