We bought one when our kids were 10 and 7. The plan was to use it for mainly half terms and a bit in summer holidays but still fly form2 weeks summer breaks.
The kids absolutely loved it so much the first year we just went for it and had 3 weeks in southern France. We whether was delightful and the outdoor life fantastic. We also found that we loved using it at home in the U.K. and took bikes with us so did lots of riding in the forests etc.
My regret was we didn't do it sooner. We have gone away with friends who had younger and it works brilliantly for them.
We only go on fully equipped sites and if possible fully serviced pitches (as lazy)! We are also lucky we could afford new so bought one with all the fancy stuff.
The best for your kids ages are bunks but don't get the 3 bunk arrangement as you will run out of space. If you can get a 6 berth with two bunks well spaced and a side dinette that you make up each night. The only problem is they are in huge demand.
We have replaced our bunk bed one now for a fixed bed and full shower en-suite!
Tips...
Check what you can tow...in reality if you took your licence post 1997 you will need to do the test to upgrade it as otherwise you will be too limited in what you can tow...and def not a 6 birth
Yes air awning definitely. Our new one has a main area and huge porch/bedroom area which can be opened up. Bought an outdoor kitchen from Aldi which is brilliant and we have a Cadac BBQ that plugs into the caravan gas point. We can cook so much outside as it has a wok attachment as well
Downside...don't expect it to be cheap, buying or going away as the camp site fees are high in school holidays. You will need a heavy car to tow and carry all the stuff like awnings as caravans are very limited as to what weight they can carry
Expect to pay out £800 - £1000 PA in insurance, servicing and storage.
We use the Caravan and Motorhome Club a lot and can book 12 months ahead for free so can cancel up to 72 hours before without cost. However a lot of private sites are better especially for main summer breaks...swimming pools and private beaches!
Ups...we have had such amazing holidays in Outdoor life is just great.
Just go for it....your kids will have amazing memories including going away for half terms etc when they would have been sat at home