I have 3 preschoolers still 4yo, 2yo and a 3month old. I use atm a mountain buggy with the adjustable handle (my hubby is very tall) with a skateboard on the back (we don't kick it) and I have my baby in a Jazsling (bought off ebay) and its works great. I have never tipped my buggy and always find it more stable with the front wheel locked. I love the mountain buggies as they never die - this is my 2nd but only cos my dh ran over the first one, but my first one I had for 5 kids and since 1995. I did trial a double buggy for a while but found them more hassle than what they are worth, hope this helps.