i have a single axle trailer. I'd like to make it a dual. What do i need to do? do i just put the new axle in front of the other one and get new fenders? is it that easy? I have a spare single axle trailer ready to donate the axle. Whos done it? is it worth? id like the insuance of having four tires in case of a blow out. plus it just looks cooler!