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Old 09-07-2014, 10:22 PM   #15
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From GM online ordering guide shows a UB7 option with a higher rated RAWR at 6700 lbs vs 6200 RAWR.

UB7 Performance Package, Higher Payload. Provides heavier duty frame and rear suspension specially tuned to handle higher payloads. Includes (C7A) 10,000 lbs. GVWR and increased Rear Gross Axle Weight Rating of 6700 lbs.
1 - Requires CC20903 model, (L96) Vortec 6.0L V8 SFI engine, (GT4) 3.73 rear axle ratio and (QGM) LT265/70R18E all-terrain blackwall tires or (QWF) LT265/70R18E all-season blackwall tires.
************************************************** *********
Rpo code Z71
Z71 Suspension Package, Off-Road, includes 35mm deflective disk twin tube shock absorbers, off-road jounce bumpers, 33mm front stabilizer bar, (NZZ) skid plate package and Z71 decals on rear quarters
1 - Requires (Z82) trailering equipment and (QXT) LT265/70R17E all-terrain, blackwall tires, (QGM) LT265/70R18E all-terrain, blackwall tires, (QWF) LT265/70R18E all-terrain, blackwall tires or (QFC) LT265/60R20E all-terrain, blackwall tires. Not available with (ZW9) Pickup box delete.
2 - Requires (Z82) trailering equipment and (QGM) LT265/70R18E all-terrain blackwall tires or (QFC) LT265/60R20E all-terrain blackwall tires. Not available with (ZW9) pickup box delete.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RPO code Z82
Z82 Trailering equipment, heavy-duty, includes trailering hitch platform and 2.5-inch receiver with 2" adapter, 7-wire harness (harness includes wires for: park lamps, backup lamps, right turn, left turn, electric brake lead, battery and ground) with independent fused trailering circuits mated to a 7-way sealed connector, wiring harness for after-market trailer brake controller (located in the instrument panel harness) and (JL1) integrated trailer brake controller
1 - Also includes (G80) heavy-duty automatic locking rear differential on Retail Orders only. Not available with (ZW9) pickup box delete or (VF7) rear bumper delete.
2 - Included with (PDA) Texas Edition or (PEB) Custom Sport Truck Package. Also includes (G80) heavy-duty automatic locking rear differential on Retail Orders and with (WEA) Z71 Appearance Package on Fleet or Government Orders. Not available with (ZW9) pickup box delete or (VF7) rear bumper delete.
3 - Will be deleted if (ZW9) pickup box delete is ordered
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RPO code Z85
Z85 Suspension Package, Handling/Trailering, heavy-duty includes 35mm twin tube shock absorbers and 36mm front stabilizer bar

These codes are from GM's 2013 2500 chevy truck online ordering guide.

It looks like the UB7 with a 6700 RAWR is a better option for towing/hauling duties for a (cc20903) 2wd truck.
And the Z85 suspension package for the 4x4 trucks. However the Z71 and the Z85 both have the same 6200 RAWR.
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Old 09-09-2014, 10:48 PM   #16
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JIMNLIN

That has been the best explanation to my question. Ordered truck this past weekend with the Z71 package because it makes the truck look so much better. I see where the RAWR is the same for both suspensions (off road or trailering). I still have concerns about the Z71 being a little softer and may squat a bit more. but I'll see when it comes in. I know how much my current trucks squats with the trailering suspension. Will post update when I hook up the new one the first time.
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Old 09-23-2014, 02:12 PM   #17
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Usually the Z71 package has different wheels and tires and these do the most to reduce the payload capacity of the trucks. You also pay for rock shields and different shocks that will be of no benefit for towing on the pavement and actually the shocks will need to be replaced for heavy duty ones to handle the payload for a trailer.
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Old 09-23-2014, 11:55 PM   #18
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Quote:
Originally Posted by elkhornsun View Post
Usually the Z71 package has different wheels and tires and these do the most to reduce the payload capacity of the trucks. You also pay for rock shields and different shocks that will be of no benefit for towing on the pavement and actually the shocks will need to be replaced for heavy duty ones to handle the payload for a trailer.
The part about the shocks would need replacing goes back to my original thought that they are softer and the reason choosing the Z71 package asks you to remove the trailing suspension package.
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Old 09-24-2014, 09:44 AM   #19
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If the payload is the same - you get the same springs. You remove the trailering suspension package so you don't pay for the same stuff twice.
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