78 Itasca lug wrench size?

[GRANDMA11]

does anyone know the lug wrench size for a 1978 itasca motorhome on a dodge chasis?

[DaveVA78Chieftain]

M300 and M400 chassis would use a 1 1/8" 3/4 inch drive socket.

Not sure about size, but M500 and M600 chassis have 2 different sizes. 1 for the front and inner dual.  A 2nd size for the outer dual.  Outer dual nut is a 1 1/8" stud so the socket is bigger than that.

You will need about a 4ft handle to produce the 300-350 ftlbs for M300/M400
You will need about a 5ft handle to produce the 300-350 ftlbs for M500/M600

Dave