@Alastair , for most of the time I admire you how hard you still go. Other times I'm just speechless.
However, my 2 cents say...... I would not imagine someone like you(with all the bells and whistles) to struggle with those supers.
Rather I will imagine that you have micro pallets(the size of a bottom board - 18mm ply with 2 legs) and the lifting gear attached to your crane. Build 2-3 stacks of 5-6 supers on micro pallets with the lids on and use your crane to put them up on the truck.
Meanwhile I wish I have proper tools. Recently I had to move my hives within the same apiary like 100m(lovely neighbour had beepoo on the washing - they didn't have in the past so.....???). All the supers on, one man show and one wheelbarrow. I walked 17km(mobile phone says). Unfortunately not all the bees followed me and 2 days later I discovered a very large cluster of foragers left behind, all on a tree branch. Lucky me, they were waiting 1.5m from the ground. A massive cluster, that needed 6 boxes. I had 2 small splits with one EQC each and I added 2 boxes with frames on top of them.
On Sunday I had a look and one colony has a nice VQ while the other one had a beautiful emerged QC so the virgin must be there. I still wait until the Qs will lay and I will move those hives too. All those 17km wheelbarrowing I was dreaming about a setup like yours - solid ute and a crane.