If it's a wind up it's a very good one - I can't see the join.
But that ladder is a recipe for disaster and as mentioned insurance for business use on a scooter and on a provisional license might be difficult to come by. Assuming you can sort that then read on macduff!
Now in the spirit of the thread - don't get a van, get a light sidecar or trailer and put a real ladder on that - a small cut down triple should do.
Or better yet put a 125L tank on the trailer/sidecar and go wfp now. The tank will last about 8 small semi's on repeat cleans - so that's £80. Home for late breakfast/early lunch and repeat in the afternoon and if really keen go out a third time for a really good day!