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Wildfire Equipment Research & Development


Roscommon Equipment Center
Detailed Calculator - Truck Chassis

DETAILED CALCULATOR-TRUCK CHASSIS >14,000 GVWR
(Enter zeros for any item not used.)

Click here to get a list of approximate weights of commonly used fire equipment items.


Manufacturer's Vehicle Weight Ratings

Enter the chassis's Gross Vehicle Weight Rating.(GVWR) lbs.
Enter the vehicle's Front Axle Weight Rating.(FAWR) lbs.
Enter the vehicle's Rear Axle Weight Rating.(RAWR) lbs.

Bare Chassis Weights and Wheelbase

Enter the total weight of the chassis prior to modifying. lbs.
Enter the weight on the rear axle. lbs.
Enter the wheelbase. (For tandem rear axle click here.) in. 

Forward of Front Axle
(All distances should be taken from the items center of gravity to the front axle centerline.)

Bumper:
       If you will add a heavy duty front bumper, enter the weight lbs. in.
       of the bumper, and distance from the front axle.
Grill Guard:
       Enter the weight of the grill guard, and its distance lbs. in.
       from the front axle.
Winch:
       Enter the weight of the winch, with cable, and its lbs. in.
       distance from the front axle.
Front Storage:
       If you add a storage area forward of the front axle lbs. in.
       (such as a chain box) enter the weight of the box
       and the items to be stored.

Behind the Front Axle
(All distances should be taken from the items center of gravity to the front axle centerline.)

Front Seat Occupants:
       Enter the number of occupants and their distance       in.
       from the front axle.
Crew Cab Occupants:
       Enter the number of crew cab occupants and their       in.
       distance from the front axle.
Water Tank:
       Enter the empty weight of the water tank and the lbs. in.
       tank CG distance from the front axle.
Water Tank Capacity:
       Enter the water capacity of the tank in U.S. gallons gal. in.
       and the distance of the water's CG to the front axle.
Hose Reel One:
       Enter the weight of the first hose reel, with lbs. in.
       hose, and distance from the front axle.
Hose Reel Two:
       Enter the weight of the second hose reel, with lbs. in.
       hose, and distance from the front axle.
Foam Proportioner:
       Enter the weight of the foam proportioner and lbs. in.
       distance from the front axle.
Water Pump:
       Enter the weight of the pump and distance lbs. in.
       from the front axle.
Storage Unit One:
       Enter the weight of your first storage unit and lbs. in.
       distance from the front axle.
Storage Unit Two:
       Enter the weight of your second storage unit and lbs. in.
       distance from the front axle.
Large Item One
       Enter the weight of any large item not lbs. in.
       listed above and its distance from the front axle.
Large Item Two:
       Enter the weight of any large item not lbs. in.
       listed above and its distance from the front axle.
    


Results

Front: Weight on axle lbs. % of FAWR % payload on axle
Rear: Weight on axle lbs. % of RAWR % payload on axle
Total: Total Weight lbs. % of GVWR lbs. of payload