Replacing Gas Tank

[Runco]

I am replacing gas tank (144 gal) in my "85" Sceptre. I want to put a smaller tank in as I don't need that much gas to haul around. I was thinking of a 100 gal tank. My question is do I lose the size from the front of the tank or the rear? I don't want to change the ride or handling tendencies. Some say to lose it up front as it will improve the ride as it will be slightly lighter up front than before. Any imput would be appreciated, the last thing I want to do is wreck the ride.
Thanks, Jack