So I was wrong twice.
Seems to be a trend.
Every time I see this thread I go back to Google Images and frustrate myself trying to find this concept truck I saw. I probably have the pictures on a hard drive I should have written the password to down somewhere.
Anyway, it had an entry door low on the right between the axles, two steps up to the front to the cab, three steps up to a rear sleeper cab that had a shower on the left opposite and above the entry.