I want to put a rear hitch on a 4000# 23' tandem axle travel trailer, 16' from cl of wheels to front trailer ball hitch, rear ball would would be 7' 6" from cl of trailer wheels. tongue weight of boat trailer is 230#. boat trailer cl axle to ball is 16' boat & trailer weight 2000 #, truck ball is 5' from cl truck axle. Can someone help me with the numbers to calculate the forces of loads on the trailer and truck? will be using equlizer hitch. Thanks bill