Our truck is 3.45 mtrs, slightly higher than the driver's cab. The living unit is almost 2 mtrs standing height inside which is comfortable enough for people shorter than me...
If you build something make it high enough to stand in. Don't worry too much about overall height as long as you don't get too close to 4 meters which is the minimum height for most bridges and tunnels in most of Europe.
IMHO fuel consumption is irrelevant for a truck this size, it won't matter much if you are 3.5 or 3.8 mtrs.
Most normal truck/trailers are about 3.8 mtrs so that should be a max guideline.
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