Scale Ticket at the Casino Load-Out
You are loading a 40-foot, two-axle motorcoach for a three-day casino trip. Placard: GVWR 37,000 lb, front GAWR 14,600 lb, rear GAWR 24,000 lb, wheelbase 279 inches. Steer tires are rated 7,400 lb single; drive tires 5,675 lb dual (four of them). Aboard: 40 passengers averaging roughly 185 lb including carry-ons, 40 checked bags of about 45 lb each, and four golf bags. All the checked bags and golf bags are in the rear curb-side bay, whose center sits about 66 inches behind the rear axle; the forward bay about 144 inches ahead of the rear axle is nearly empty. Scale ticket with full fuel and everyone aboard: steer 13,900; drive 24,300; gross 38,200. The driver behind you in line says the scale always reads 500 heavy, and the group is waiting.
1. Which limits are exceeded, by how much, and which one is the binding constraint?
Read the worked answer
Work each limit separately; the smallest one wins.
- Steer axle: 13,900 against GAWR 14,600 and tire capacity 2 x 7,400 = 14,800. Legal, with about 700 lb of headroom.
- Drive axle, GAWR: 24,300 against 24,000 - over by 300 lb.
- Drive axle, tires: four duals at 5,675 = 22,700. At 24,300 you are over by 1,600 lb. This is the binding constraint: it is lower than the GAWR, so the tire rating, not the axle rating, is the real ceiling.
- Gross: 38,200 against GVWR 37,000 - over by 1,200 lb.
So you have three violations and the worst one is the one nobody at the terminal is talking about: the rear tires. The 'scale reads 500 heavy' story is worth nothing, because you are 1,600 lb past the tire limit, not 500. Overloaded rear tires on a three-day trip build heat, and a blowout on a loaded coach at highway speed is the failure mode that ends careers.
Every one of these is the driver's problem. The scale ticket is the record of what you chose to drive.
2. Can you fix it by shifting the luggage to the forward bay? Show the arithmetic.
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No. Moving weight changes axle loads by a fraction set by the wheelbase, and here it makes the front axle the new problem.
Moving a load forward by distance d shifts weight off the drive axle and onto the steer axle by:
shift = load x d / wheelbase
- Load in the rear bay: 40 bags x 45 = 1,800 lb, plus four golf bags at about 40 = 160 lb. Total 1,960 lb.
- Distance moved: 66 inches behind the rear axle to 144 inches ahead = 210 inches.
- Shift = 1,960 x 210 / 279 = about 1,475 lb.
Result after moving everything forward:
- Drive: 24,300 - 1,475 = 22,825 - still 125 lb over the 22,700 tire limit.
- Steer: 13,900 + 1,475 = 15,375 - now 775 lb over the 14,600 GAWR, and past the 14,800 tire capacity.
So redistribution fails on both ends: it does not solve the rear, and it creates a front overload. The bus is simply carrying more than it can hold, and weight has to leave it.
3. What is the actual fix, and how do you handle the group and the paperwork?
Read the worked answer
The fix is unloading, not rearranging. Take the 1,960 lb of checked bags and golf bags off the coach and send them in a follow van or second vehicle.
Check the numbers:
- Drive axle: the rear-bay load sits 66 inches behind the axle, so it loads the drive axle by 1,960 x (279 + 66) / 279 = about 2,424 lb. Removing it gives roughly 21,876 - under 22,700.
- Gross: 38,200 - 1,960 = 36,240 - under 37,000.
- Steer: drops slightly to about 13,450 - comfortably under.
If a van is not available, the alternative is leaving people behind: 1,600 lb of drive-axle relief is roughly nine passengers at 185 lb, and that solves the axle but leaves you close on gross. Bags are the cheaper answer.
Then reweigh - never sign off on a calculated number when a certified scale is 200 yards away. Keep the corrected ticket with the trip paperwork, note the offload and the reason on the report, and tell the group the truth: the coach is at its rated limit and the luggage travels separately. Do not 'solve' it by airing the tires above the sidewall maximum, and do not accept the 500-lb folklore - the placard and the sidewall are the limits, and you are the one who signs for the load.