Well you have asked the millon dollar question
, there are so many diferant variables in a truck that the price can go from one extreme to another. For instance you are asking for example a volvo, a volvo in most cases is going to be the more expensive truck to strtch because they use a more expensive drive shaft, the steal is a differant size and thickness, some cabs have a weird fiberglass type pressed floor that has to be finished off when cut with bondo there are so many diferant things that can affect the price so any ball bark price i give you could be way off and I would not want to give anybody the wrong inmpression good or bad if you would like to call me and tell me a little more about a certain truck and dimmensions. for the length of truck you want and about how long it is now I can get you real close. thanks Jason 1-800-752-9815