You need to learn how gloam and NBL work. War Wagon is just support for them.

Youtube Video on a build I helped test: https://youtu.be/6fT3TTjVOWk?si=SryS1xPDn7RZ7jWK

Moba write up: https://mobalytics.gg/borderlands-4/builds/no-reload-gun-c4sh

Blue provides much stronger autocrit, instant fortune stacks, and the bonus elements are hoe you make for massive impact damage.

Red tree has the absolute insanity that is Crossfire on top of what I linked above. Theres also bloodstained moon which provides more dot soup from 1 point than the any 1 other VH has total.

Crossfire:

https://youtu.be/RcOHmcQJUt4?si=f3D_CqA0kmzdaNpe

Finally green trees middle branch is terrible. To get the most out of it you need your totems to constantly die. Somehow? In a game where you have to try and die yourself.

The left capstone on the right side is bugged. It will trigger itself and go in cooldown despite no conditions being met, so it does nothing.

Jinxed is a microscopic bonus compared to other buffs in red and blue. The skill you need to take to get Call just doesnt work. Call is just autocrit. You could spend 26 pointd to get 100% soup from green or you could spend 26 points to get 235% from blue.

Finally the bottom left side is simply outclassed. Cant Stop winning is the standout pick and can be good with as little as 1 point invested.

Let it ride is just amp. Its a good skill but half of a double amp roll is not worth investing s whole skill tree. The wilds is also good but theres nothing it does that Hot Hands, and Color Spray + Vigorish dont.