Personally, I wouldn't be worried about the size. We've got a family of 5 and have a small rear fold camper. The two eldest (8&6) are in swags that go under the 4x4 awning. My trailer is 3mx1.85m, and the soft floor tent area is only about 2.5mx1.85m!! The camper has got a big awning that runs the length of the camper though. We are campers who tend to live outside, and under the awning, we hardly go inside the tent area. Friends of ours have the traditional side fold and 3 kids, and they admit they couldn't cope with our set up, so YMMV. The only thing we struggle with is water as it has a small tank so we have to take a couple of extra jerries along.
For me, weight, size and off road ability was a big consideration too. Trackabouts are about 5m long when packed up, My trailer, the X1's and DOT's are about 3m which helps with your rampover.
A low weight is something the Patriot and Drifta also have going for them which reduces fuel use and stress on the tug. Trackabouts start at 1T, the X1 LE is about 860kg dry, and the DOT 6 is 700kg dry, but they do sacrifice payload. Trackabout have about 900kg-1T payload the, X1 LE payload is only 340kg, the DOT is 500kg. Once you add the 140litres of water in the X1LE, you don't have a lot left (200kg). My trailer is about 810 dry, and a smidge over 1T loaded including 100L of water. So we carry all the food and the fridge in the tug.
We did look at new Cubs, Trackabouts, Patriots, and the Drifta Offroad Tourer but I really couldn't justify the price so we compromised on the second hand and kept $20-30k in my pocket... And $40k for the Base X1 LE is a lot of coin....
