Not a good idea. That much current will result in significant arcing inside the relay and could even start a fire.
If I were you I would buy this one . IT'S A DUAL 30A DRIVER ! (and it has the DIR/PWM inputs !)
http://www.aliexpress.com/store/product/Free-shipping-New-0-24V-Dual-30A-H-Bridge-DC-Motor-Driver-Peak-60A-for-Robot/710410_634914339.html
LOOK AT THE PRICE !
That's a giveaway ! A single is worth $30. This is a DUAL for $32.