I really like the second gen 4runners. Not as much as first generation, but my girlfriend has one she flopped on an icy road a year ago, jacked up the IFS and tweaked the frame a little and roughed up the passengers side but still runs fine, and its a manual 22RE. I have been wanting to SAS it and turn it into a pure trail vehicle. It is just collecting dust up at her parent's house and they insist on keeping it but never do anything to it.
I like seeing the 2nd and 3rd gens done up as trail rigs. I dont think the weight factor is really that big of a deal. Go wider and if you are that concerned, hack the top off and do cage. I think the extra room and seats is nice. you can still haul just as much if not more than a pickup and all you really have to do is compensate for the extra weight up top while wheeling. I say go for it, and make sure to take some pictures!