There have been some very useful posts on this including your own--perhaps the one point that is being missed here is the old chesnut== DA MONEY.
Inevitably doing the job properly and safely involves a cost and as you may recall the original post related to someone who was cheapskating by haviing their Wedding in the open ---as I read it without cover
Therefore this kind of person may well be tempted to cheapskate on the generator which I think you might find is behind many of the problems
that DJs on here suffer from with Generators.
Our short experience in the Rodeo Bull market tells us that its the same---people want us to do the booking with a generator because they have chosen some stupid location to hold an event and expect it to cost another £50.
As we need at least 12.5 kva forget it.
You can carry your own jennie but by all accounts apart from it not being cost effective to buy one based on the number of hires needed ---it stinks out the van
So I agree with you that its possible to safely use a Jenny---whether you can get the skinflints out there to pay for having the job done properly--unless its Corporate or wealthy clients is the issue.
Incidentally regarding Artic Cable being supersceded by yet another Electrical upgrade really annoys me--especially after asking the DJ shop the correct cable to buy and find a year later its out of date.