Ok here are the facts as close as can remember. 96 to 02 volvo built the vnl 200 (4x2) vnl300 (6x4) vnl 610 midroof vnl 660 small condo vnl 770 big condo. In 03 they were redesigned with new hood etc daycabs kept same model numbers and sleepers are vnl 630 vnl 670 vnl 780. Also offered are a short hood version in day cab and sleeper models called the vnm most sold as daycabs with very few sleepers. Dart transits volvos are vnm's. The vhd has it's own hood with the basic Volvo daycab but is different underneath as it is a vocational chassis. The vnl430style single bunk is the only sleeper offered on the vhd. A better option to build a vhd might be starting with a resin daycab conversion for the 780 kit. Volvo also builds a special model for auto hauling the vah 300 430 and 630. The hood is similar to the vhd with a chopped top cab and low profile chassis.
The KW could be a number of ratings. Prior to the early 70's turboed Cummins weren't aftercooled. Could be a 262,270,280,290,335 very early small cam 350,380 and so on. The Freightliner almost likely a 400 as the big cam 400 was quite common in that era. Cummins are hard to tell hp by appearance. Turboed Cummins can be 743 cid or 855 cid as well and are very similar in appearance.
I believe they also had the bigger air cleaners. They were the last Monfort w 9s as the next group Monfort bought were k 100s with 8v71t 350 detroits and allisons. The detroits didn't hold up well and some were replaced by the then new Cummins kt 450. Really liking this build.