As you see my post about jigging/popping rods, I like to experiment a lot with different things. Railing is one of them. In fact, I developed porta-rail to jig more than to fight tuna. Tuna jigging requires long hours, oftenly over 10 hours non-stop. It is not easy to jig non-stop over 10 hours even for a strong guy.
Nowadays I don't use the rail to fight any tuna under 200 lbs as I am experimenting to fight a big tuna without harness or any other help by using my body and moving forward and backward. The technique is so effective anyone can land a big tuna with the technique without much problem.