Check Extended Cabin Truck Length
Each sleeper or extended cabin truck is designed and laid out differently. Every manufacturer has their own way of doing it, whether it is Freightliner, Volvo, Peterbilt, or whoever. So decide what you need and what will work best for you.
Something else to consider as well is that different states has different restrictions on size, length, weight and etc.
Now this might not pertain to you and where you work but it could if you go where ever the load is. The Ice Road up north might not hold the weight of your truck (when including the cab, trailer, and the load), if you have a ridiculously huge sleeper or extended cabin truck.
Also there might be restrictions on the trailer size you can haul, if your cab is too big. This can affect your weight limit at the weigh stations and scales. Another consideration is the overall length, when combine the tractor and the trailer.
Remember, something else to consider in the size of the truck’s bed; will you fit comfortable when you are stretched out?
Source: www.curtain-tracks.com