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| I don't think your measurements are right. Measure your current truck from the center of the front axle to the center of the rear axles and subtract 1'8".
195 ft wheel base tandem truck, 41 ft trailer with 22 inch king pin, estimated lengths.
You need to be legal on all axle weights, and all other bridge weights. The bridge laws list the weight limits by feet length, but the round down if less that 6 inches and up for 6 or more inches.
Axle 1 to axle 5 at least 51 ft to get 80,000 lbs.
Tandem axles can only carry 34,000 lbs.
the front must carry at least 12,000. Most trucks are specked with 12,000 lbs steer axles, so to get 80,000 lbs, the tandems must be at 34,000 lbs.
Axle 1 to axle 3 must be able to carry 12,000 on steers and 34,000 on tandems, so at least 14' long (13' 6")
Axle 2 to axle 4 must be able to carry 68,000 lbs, so at least 36 ft
With a Wheel Base of 195 inches (16' 3"), its easy.
1-2 14' 8"
1-3 17' 11"
Trailer from king pin to axle 5 37' 8"
So if king pin is 6 inches in front of center of tandem gives
axle 1 to king pin 15' 10"
axle 2 to axle 5 38' 10"
1 - 5 53' 6"
You could get by with a 39 ft trailer, or a shorter tractor.
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5th wheel + overall length
