For camping with large groups, what is the recommended stove?

I understand your concern about your 2-burner Coleman stove slipping. Here's an article with a very simple and cheap DIY on how to prevent your Coleman camping stove from sliding. Coleman 2 Burner Camping Stove DIY Non Slip Bottom Traipsing Around

Yes - take a look at the Camping Bug site for a good range of water tanks. It really depends what you exact needs are; do you camp for a long time? are you a large group? do you camp in remote areas?
you can probably send them a question and they will advise you.

When buying a camping stove, you should look for two things:

• How well the stove performs- mainly the amount of time it takes to boil water. Good performance would be somewhere between 3 and 5 minutes.
• How efficient the stove is- how long it will be able to cook for. Last thing you want is a camping stove that will stop cooking before your meal is ready.

The most durable and low maintenance stove is the Multifuel stove which can suit you just right for a long international camping trip.

The recommended stove for ultra-light backpacking, if you don't want to carry much weight, is the alternative-fuel stove.

The recommended stove for summer backpacking is a canister or an integrated stove system.

Amazon sell tents that fit between 8 and 12 people. http://www.amazon.com/Family-Tents-perfect-backyard-camping/lm/2DOAN9S14UDJ7 . I think if you are a bigger group than that, you might need more than one tent.

I recommend selling it on eBay because camping gear is one of the more popular sales items.

I have an MSR Pocket Rocket Stove and I absolutely love it. I've had it for ten years and it has never faltered.

No. You should only use propane, as directed, in a propane camping stove.