Why are some day cab tractors so long?

some companies take a truck thats 3 to 4 years old, and have the sleepers removed, to use local, and replace with new for over the road, pete 379's and If my memory is correct w9's also, the sleepers can be removed,

 

Bridge formula

http://www.ops.fhwa.dot.gov/freight/sw/brdgcalc/calc_page.htm

 

Above post is correct for this area: They are simply older sleeper tractors with the sleeper removed for more local work.

 

the new macks we have where i work seem rather longer then normal but they never had a sleeper at all. straight from the dealer brand new. guess its just the style of them.

 

We have long wheel base tractors as well... Right from factory like this... Never any sleepers....

We haul heavy so I just assume it is to help take weight from the drives and steers.... Like when your pulling the dump trailer which is only about 36ft...

I also was told it helps have a better riding truck as oppose to the short wheel base trucks....

Look at my sig pic.. The truck is longer then your normal day-cab truck.... We have lots of extra space between the cab and the trailer

 

Thee sleepers are removed to lighten the weight of the truck. We never shorten our trucks out of fear it would mess up the way they rode. Alot of companies are getting day-cabs at 200" to 220" wheelbase because they ride alot better.

 

It also allows for extreme kingpin setback. Once in a rare while a 53' and especially a 57' may have a kingpin setback of between 5' and 7'. Shorter trailers for special applications may have an extreme kingpin setback also.