Again ... I said
IF all he wants is frt and back.
If you want 'seperate' control of 'each' corner, then you 'will' need 8 valves.
Otherwise you can still have precise control of the truck, using 6 valves, with more switches ... just with a downward travel.
Prewired switch boxes huh ??
I hate those things ... I'm ol'school man. I still make up my own panel and switches boxes.
Since '88 when I was (still am) messing with the hydros ...
BTW, your allowed ONE disagreement with me !!!
JK, it's all good !!!