I have narrowed it down to a step deck but have a few questions

Does the back axle slide…?

 

Hey On-Time
This is Swamp in case you forgot, lol..

Congrats on the fine looking setup partner.!

In regards to your dump valve, mine was wired up to a separate 4 way round, but I had to figure which pin it was wired to also. So this might be a goofy way of doing it, but it worked for me..

Build up air pressure with red knob pushed in, & shut off truck so its quiet..

The ground pin on the 4 way looked different than the other 3, so that was easy. Maybe the ground on the 2nd 7way is the same.?

I took 2 short lengths of wire, & a little 9volt battery from my kitchen drawer. Wrap one wire on the 9 volt +, one on the -.. Put the - on the 7 way ground, and start testing the remaining 6 prongs with the +. You'll here it dump/hissing when you find the right one..

I was surprised, but it had enough power to actually work..

 

Genius with the little battery. I pulled a battery out of one of my vehicles and lugged it to the truck to figure it out.

OP, does the trailer have a second 7-way? And does the truck? Look inside the connections if it does. The center pin will be a rounded tip prong, or two thin round prongs that's hollow in the middle. If it's the second style, you'll need the yellow ISO pigtail. The regular green pigtail won't plug into it, just FYI.

 

The trailer or the wife?

 

Point of curiosity, any good reason to not change the yellow style over to a standard green plug end on the trailer?

I ask because i have a tractor with a double 4 pin to 7 pin green carrying abs, and the aux switch for trailer is running on blue in the main pigtail, whereas the trailer is set for abs blue on the main pigtail, and a yellow female end to carry the dump valve.

Kinda annoying, but ive got to change one or the other, which do you suggest?

 

Not sure any of this had been posted.

I used to carry 10-24' chains. I cut 4 of them down. 4-10', 4-4' and 8-5'. I still need to cut two more down as to 12'. Since doing this, I have only used the longer chains 2-3 times in about 3 years and only because I needed a couple more 10' pieces. Much easier to drag around.

Also on ramps. I always carried 2 sets when I had my step. A 3rd set would've come in handy for a few loads and was actually required for some loads I never did, but paid very well.