Hello. We are hanging yet another swing...this time in a porch with joists that rise from the ends to the center peak (A-frame style?) So, the exposed joists do not line up with where I need to place hangers, so is it ok to install a 2x4 or 2x6 board across several joists that allows me to drill where I need to? The swing is 60" long, but the joists are 24" on center. I could put one hanger through the cross piece and joist, and the other just through the cross piece (eye bolt with nuts). Any advice is appreciated...thanks!!