Can't help you with the Reese... I know that when I installed my Equal-i-zer hitch on my 210WBS, I had to set the brackets at the shortest distance (hitch to brackets) allowed, but, it cleared the tanks handily at that position.
I know that the Reese chain up position is a little more restricted than the Equal-i-zer brackets, but, I should think that Reese also would have a "range" of acceptable latch up positions and one of them would clear...? Maybe someone has a Reese on theirs and will comment. Possibly, your Reese will turn out to not be such a bargain if the tanks have to be relocated.