Airbag Systems Comparison
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ABCDEFGHI
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DesignerGeneral MotorsLeigh HarrisonJim KanomataZeb FradyDan HensleySilver Motor CoachTodd SullivanAlex Sirum
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System nameOEMFour BagQuadra BagSouthlandHensleySilvertoneSullyBilt
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Year introduced19731995201020111991, 2011 GMC2011
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Bags per side12211112
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Bag manufacturerFirestoneFirestoneFirestoneFirestoneFirestoneFirestoneFirestone
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Bag part number8301W01-358-3400W01-358-7325W01-358-9294W01-358-7325
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Bag vendor, USA, retailnoneLeigh Harrison, generally orderableApplied GMC, COOP, Alex Sirum, Grandview, MGM, generally orderableSouthland Motorhome CenterApplied GMCgenerally orderableApplied GMC, COOP, Alex Sirum, Grandview, MGM, generally orderable
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Bag price w/o shipping, each (date)
n/a$105 (Jan 2015, truckspring.com)$98 (Jan 2015, appliedgmc.com)$300 (May 2011)n/a$151 (Jan 2015, truckspring.com)$110 (Jan 2015, truckspring.com)
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Max height under bogie
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Min height under bogie
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Bag pressure at max height, psig10588
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Bag pressure at normal ride height and weight, psig80-90100-11080-909090-1007060-65
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Leveling range, inches: +up, -down full: +4, -4reduced: +3, -4 full: +4, -4reduced: +3, -4greatly reduced full: +4, -4~ full: +3.75, -3.5
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System vendornoneLeigh HarrisonApplied GMCSouthland Motorhome CenterDan HensleyApplied GMCTodd SullivanAlex Sirum GMC Motorhomes
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System vendors, otherGMC COOP, Alex Sirum, Grandview, MGM
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System price w/o shipping, both sides (date)n/a$1075 (Jan 2015)$1598 (Jan 2015)UNAVAILABLE? (Jan 2015)

$750 (Jan 2012)
$600 (Jan 2012)$690 (Jan 2015)$702 (Jan 2015)

($400 galv brackets + $302 bags)
$849 (Jan 2015)
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System weight57 lbs
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Shipping price, ~2000mi USA
n/a$50$34 + bags
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Time to install, both sidesn/a4-6hrs4-6hrs1hr1hr1hr1hr
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Ease of installationn/astraightforward but some difficult to access and/or high torque workstraightforward but some difficult to access and/or high torque worksimple, bolt-onsimple, bolt-onsimple, bolt-onsimple, bolt-on
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Systems installed (date)12,921 (1979)200+ (Jun 2011)12 (Jun 2011)5 (May 2011)5 (Jan 2012)
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Design features• should survive loss of single bag per side (2x load on remaining bag and tire!)• should survive loss of single bag per side (2x load on remaining bag and tire!)• can travel with bags deflated, ~2" clearance between tires and wheel wells• bags have internal bump stop (can travel with bags deflated?)
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Reviews, fans• improved handling (esp for towing)
• good protection of hoses and bags from road debris
• improved handling (esp for towing)• rides like OEM• rides like OEM
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Reviews, skeptics• firmer ride than OEM
• isolated report of damage to center support under extreme road dynamics
• firmer ride than OEM• rides like OEM• question about side-load stresses
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Notes• bags no longer manufactured
• some NOS bags are still available but cost prohibitive (e.g. Cinnabar, $700/ea?)
• adapted from Harrison design with many updates (details?)• some portion of the system is claimed to be patented, but cannot find confirmation or details
• Southland is only US distributor for bag, but it is said to be common in international trucking use
• website is damaged, but shows no indication of continued GMC business (Dec 2012)
• bag/cone system original on Silver MC vehicles in 1991
• repurposed for TZEs in 2011
• future availability and current bag age uncertain
• modification of Mark Grueninger design
• mounting plates available in multiple materials, finishes, and colors; price is for galvanized steel
• Sully does not sell air bags; order them online
• Sully encourages home-fabrication of his design, plans are available
• site says "new style" air bag system in stock, no link or info (Jan 2012, Dec 2012)
• link to photo gallery added (Sep 2013)
• bag part number read from photo in gallery (Sep 2013)
• price is for "complete system", which I interpret to mean "both sides"
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More informationLeigh Harrison product pageApplied GMC product pageproduct page offline (Jan 2015)Applied GMC product pagebdub.net/sully product page and installation instruxAlex Sirum GMC Motorhomes photo gallery
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installation instructions (PDF)GMC ES presentation (PDF)installation video
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air bag data sheet 3400 (PDF)air bag data sheet 7325 (PDF)air bag data sheet 9294 (PDF)air bag data sheet 7325 (PDF)
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bellows data sheet 224 (PDF)bellows data sheet 26 (PDF)truckspring.com air bag spec sheet
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