So sad to hear this pain has befallen your family Brian, it's terrible to see such awful events happen to such lovely people. if you need anything just ask. Si
If it's what you really want i would say try talking him down a bit as the worst he can say is no, they aren't getting any more common so even if you pay a bit over the odds she will still be a good investment if you plan to keep her long term.
My brother has AT2's on his cherokee and he finds em quite noisy, also they seem prone to grumble between 50-60mph . Personally i don't think they're bad but then i'm used to insa dakars howling away in my 90 so a jcb feels like a smooth quiet drive to me. :)
My mrs had a k series for 5 years trouble free, then the first time i drove it the head went...... probably says more about my driving than the design, :oops::D