I agree with Phil O - Bilstein shocks.  Superb for towing.
My first choice for tires would be Hoosier, as we obviously
need to support those who support us. (Dealers can be found 
on their website - www.hoosiertire.com I think.)
I have a set of their Radial Rib tires on the front of the dually
and they have been excellent.  For a 1/2 ton Suburban, the Radial
A/T is right for Mississippi weather, and perhaps the LT235/75
R15/C (if you don't mind higher pressures) would serve well
for towing.
If you run Kumho tires on your competition vehicle, they 
also have  P-metric/LT fitments.
Wiring:  
Terminal 1 - white      common ground
Terminal 5 - red        stop and lh turn signal
Terminal 4 - black    (trailer) battery charge
Terminal 7 - yellow    extra auxiliary circuit    
Terminal 3 - green    tail, license & running lights
Terminal 6 - brown    stop and rh turn signal    
Terminal 2 - blue        trailer electric brake
Thanks again for the Meridian hospitality,
Roger
 
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