Leaf Spring upgrades for First gen Tacoma?

Hello All,

I Have a 2004 reg cab tacoma 2.4L v4 Manual with about 260,000 miles. I use it mainly as a work truck. I'd like to upgrade or maybe just replace the leaf springs from what I assume are the originals currently on the truck.

I'm not necessarily trying to increase payload but would like to feel better about adding a lumber rack to the bed which would be a more permanent and continuous load on the springs. I have already replaced both the front and rear struts with some bilsteins.

Would it be better to install one of those add a leaf kits? or just replace the springs with the same amount of leafs but just new parts?

Any recommendations on brands or parts that are compatible with first gens?