Help modify a king hauler with MFU

[Papy]

No problem to fit the mfu in a shortened sleeper.
You may have to abandon the loudspeaker box, but otherwise it's a relatively easy (although tight) fit.

It's what I did in this truck : KH with shortened sleeper

By the way, as already mentionned by another forum member, you could consider much smaller sound/light modules available on the market (Beier, Servonaut, etc...)