How much gas?

[biggirafe]

Tongue in cheek answering in this thread but someone a couple of weeks ago on here had the brilliant idea of carrying their Honda 2 kw genny in the gas locker and having under slung gas tanks.
Seems a great idea as we also have the Honda and it is a pain in the neck to get it out from under the bed.
Who is the best supplier for under slung tanks fully fitted and at least the equivalent to 1 x 13 kg and 1 x 6 kg Calor
With European adaptors.

I don't know if they are 'best' but fes also do car conversions to lpg so can supply and or fit pretty much anything lpg