To Stroll or Not to Stroll ...

So, I decided that I wanted a triple stroller. It made me really motivated, and I sold a whole lot of baby stuff that we're finished with. The exact stroller I want is on Craigslist for a mere fraction of its original $1000 price tag. And - it's been listed for two months, so I'm sure they'd take even less than they've listed it for. I'm hesitating though, because I'm wondering if I can really push such a thing with such a load in it. My kids are 39, 28, and 19 pounds, plus the weight of the big beast itself, which most definitely brings me to a load of over 100 pounds! Do I really want such a thing? And do I want it around here, to push up and down the hills?