Folding bike for a heavy rider?

Recently I got ignited with an idea of getting a bike for commuting to work, really like both aesthetics and practicality of folding bike. Easier to store at work in the break room, easy to haul upstairs, where I live, to not leave it in communal space for a night. One issue - my ass is rather fat. I'm at 240lbs currently and all the bikes I found so far are around 200-230 weight max. I'm looking secondhand for around $250-$350. I did find a few bikes by some "langtu" manufacturer, which seem to boast around 240-250lbs max weight, and even a bit cheaper than other options like Dahon SUV d6. Do 10 pounds matter that much?