A sway bar is essentially a torsion bar, I don't think that just hose clamping two together would make them any more resistant to twisting motion. Applications from other vehicles could probably be made to work, but clearing the driveshaft and oil pan are going to be the biggest obstacles.

As Roger mentioned, Erik B has a Tacoma bar on his truck. It is the best setup I have seen, he has info on his website. I know that Roger has the rear bar, but in theory if you stiffen up the back a lot more than the front the car will want to oversteer, not what I want in my high center of gravity rockcrawler. I think that adding front AND rear bars would be the real hot ticket for street use.