we live on a dirt road, a mile from the country store.
i walk down and back up that hill often (for the exercise, adult company and coffee!)
i use our two seater (from walmart!!) all the time, and it works just fine.
i got the one with the biggest wheels, and all are fixed. it turns better than my single seater did!
the only bummer is that it is BIG and doesn't break down easily to go into town. (where i make the big kid walk! and i sling the babe.)
good luck to...