What happens when you run a bias ply tire with radial on the other side of a trailer?

I have a bias ply spare for my boat trailer. However, the boat trailer is running radials. Will it hurt to put on the bias ply if I have a blowout?|||Won't hurt a thing. But because the radial will give side to side, it may not track straight at highway speeds.|||I feel that the tires will be fine.Radial tires have wires in them and the only thing will happen is if the the wire breaks internally the tire will vibrate and the trailer may sway back and forth.Good Luck.