Our setup isn't perfect but it works well for us and we regularly feed anywhere from 2-6 people.
We have a standard 2-burner propane stove and cheapo portable gas grill connected to a 10 lb propane tank using a T adapter so we can use both at the same time. The tank is bulky but lasts for ages and is way more convenient and economical than the green 1 lb cannisters.
For cookware we have a pressure cooker with several pans with lids and a Trangia kettle nested inside it. The pressure cooker is great for feeding the hoards and even without the lost weight boils water significantly quicker than a regular pan and keeps it boiling on low. The kettle is for making tea and heating water for washing dishes, in that order.
To that end we have one of those ubiquitous blue 5 gallon cuboid water containers that probably needs washing inside. And a full-size plastic washing up bowl which we accidentally left at home once. Never again!
Most importantly we have metal cutlery (silverware), plastic dishes, mugs, wineglasses, etc for six that are washed and reused.
And a small frypan, plastic colander, chopping board, corkscrew, can opener, bottle opener, spare corkscrew, sharp knives, pan holders, kabob skewers, several spare bottle openers, lighters, detergent, bug spray, yard guard, ...
We haven't really worked out a good storage solution for all this stuff and food. Rubbermaid tote boxes aren't very efficient because they're not square and are either too tall or too short. Cardboard boxes from the liquor store are free and work fine until they get wet or are raided by chipmunks (who eat through tent bug screen as an appetizer.)
Also this spring I found a
picnic bench on sale for $30 at Sports Authority. It does feel a bit fragile and I'm not sure I'd pay $120 for it but its really compact and light and works surprisingly well.
My holy grail for family/group camp cookery is to halve the amount of stuff we take and still eat like royalty while not grilling on a campfire. Basically I would love to have a single stove that cooks and grills easily and cleanly on white/unleaded gas. But I suspect thats an oxymoron.
Cheers,
Graham