Is the Dew steel framed? It really shouldn't matter. But steel would be a good choice for you. I'd think the Kona would be up to the challenge. Just have the wheels gone over. Spokes releived and tensioned. They should then hold up just fine. Good luck with the bike. Not knowing the particulars and component level. At 500$ it sounds decent. I'd say if it fits and you feel good on it, Then get it. The price is right.
Mark Shuman