fj oem alloy wheels rims

I am running the OEM rims (16") on my '06 Tundra Ext. Cab. It has some kind of Hankook tires that are wearing down. I was considering picking up a wheelset of the FJ 17" alloy rims with the stock Bridgestone Duelers. Two things - First, is that setup any heavier than what I have now? Also...