because of the tranny hump you really need 1 on each side, I got 2-500gal per hr bilge pumps at Walmart |removethispart|@9.99 each, thats 20 gal per min total.
My X stays pretty dry if i make it across with no problems, its when I get stuck and have to get out and hook up the winch that the water builds up, last time it got high enough to flow over the hump and got the top of my seat wet.....
The bilge pumps should keep it down to a inch or two, then i can just open up my drain plugs when i get out...