My ‘best’ one was a run from Derby to Gourock in an artic. Trailer was sealed on the bay so I coupled up, did my checks and set course for the land of men in Skirts.
The next day I arrived at the Amazon warehouse and took off the padlock and broke the seal only to find the entire load was one box on a euro pallet.
They did back load me though, I picked up three pallets at Preston on the way back down.
Didn’t Rikki , when on for Murffitts, run with a bolt from the UK to Italy as the contract required so many trucks a week.?
Roymondo:
0This was this morning’s trailerload, loaded for two drops around Heathrow. Returned to Northampton empty. I’m sure in the bigger picture it made economic sense, but I simply don’t believe we didn’t have a rigid going in that general direction with a small amount of spare capacity…
Once had a trailer with one small euro pallet ( the size of the smallest in your pic ) to collect from Edinburgh and delivered to Boulogne in France . Full load of veg from Ostend airport after though .
Had one pallet with 6 boxes of bread from Portadown to Rugby but again a full load back to Belfast .
The-Snowman:
Eagerbeavers done a 40 mile round trip with 1 cup of coffee…
I though it was a 40 mile diversion for 1 cup of coffee 
it was normal on a company i used to work for in the 60s to pick up an envelope..take it to a ship in Southampton, to find its sailed to Spain..so had to chase it there..mind you it was a contract for Shell ` and another company i worked for did one pallet loads to the continent…but they were drugs for Glaxo…and they paid handsomely…and an ■■■■■■ sometimes too.
Daftest one for us was a tin of paint to Rome. In a van though.
When working at Europa in the 90’s, we did groupage to Spain/Portugal, return loads would be clothing from Portugal or shoes/clothing from a factory in the south west of France, not always full loads. I remember once, was in Barcelona, got a call from the export dept; " Got nothing in your area to bring you home, can you pop over to Milan for a full load? !!! " 
Wasn’t going to argue with those instructions was I 
Lovely trip all along the Mediterranean coast to Italy it was then. 
Very nice 2 day run, was told not to rush.