I have never taken my 3 wheeler on an escalator with steps, so I dont know how it works! (I thought you werent supposed to take any prams on those step escalators?) If you were to do that with a 3 wheeler than it is likely to be unbalanced as the top/front is lighter.

I am considering buying myself a cheap 4-wheel stroller now, as Aidyn is older and I use public transport. My big bulky pram is a huge hassle on buses especially cause you have to somehow fold it up (whilst holding baby at the same time) and then get them on the bus, which is sometimes too crowed for a giant pram to go somewhere... *sigh* I cant wait to get another car...