Replying to Help with car selection

So here's the deal:
I currently have a Subaru Forester worth ~$3000-3500. I want to trade someone (a private party, not a dealership) for a more truck/SUV style vehicle, as I would like to start towing something. Here's the requirements the new truck/SUV must meet:
Easy to work on (preferably an older model of something)
Be able to tow at least 3500 pounds
Get decent gas mileage, as it will become my commuter (ideally above 11 mpg)
Be of similar value to avoid paying much more (although I'm willing to add cash to the trade)

I've been thinking an older (late 80's) 4runner, but I don't know if that would meet my towing weight requirements. Obviously the value of the vehicle depends largely on the condition of it, but I'm just thinking something that usually hovers in that general range. Any help and pointers/advice are much appreciated and will be met with +k. Thanks!