I am not sure if I can be of any help or should I say Mr. Holmes here at Holmes Airpark 3IS5. We have a Helipad and fuel station. Air-E-Vac uses this spot. Look up the location we are just south of the Abraham Lincoln Capitol Airport.
I have seen 5 Helicopters on the pad here before so I know 5 helicopters can land at once. If you need more info contact me and I will put you in contact with Mr. Holmes. These Helicopters use Jet A fuel.

Tony