All very logical IF you have plenty of parking and easy access from the parking to your plot.
At our allotments parking is very limited, and since they sub-divided into half plots (5 rods IIRC) only the plot holder nearest the track has any chance of parking a Land Rover or a trailer at the plot.
Ours is a 'C' plot which means you have to trek down from the track past 'A' and 'B' to get there - in fact there may be four plots - I need to check if it is 'n' then 'nA' 'nB' 'nC'. Anyway it is a long trek from the minimal parking to the plot. Coupled with the logistics of moving your 'nickables' from your trailer (if you can find room to park it) in several trips both going and coming it is not an easy task.
It is a real PITA if you haven't got room to park a trailer and you have to heave everything in and out of the back of the car (including the wheel barrow to move it all in) each time you go down there.
The result is that most plot holders leave the basic gardening tools - spade, fork, rake, hand tools etc. - down at the allotment so that they are there when you need them and not a major pain to take back and forth each time you visit.
I would love to be able to use an old Defender as a mobile shed :-)
There is SmartWater in use at the site.
We are also a relatively low crime area.
The major security (apart from prickly hedges) is the combination lock on the gate.
However most people are too lazy to re-lock and scramble the combination.
Many are too lazy to even close the gate.
Still, level of theft remains low AFAIK.
I am looking forward to the shed going up as a place to sit and admire the allotment on a summer evening - so I am probably deluding myself.
Cheers
Dave R