M System

1951 Vintage Travel Trailer "M Systems"

M System Trailer Coaches (by 1954 a division of the Mid States Corp.)

M Systems Trailer Decal

Manufacturer Information

Joesph Bonelli was the founder of the M-“System” corporation. In 1935 he organized the company. M-Systems were made in Vicksburg, Miss. F. L. Cappert bought the company from the Bonelli family and then Cappert went on to make Magnolia Moblie Homes and his son is still in business in Vicksburg, Miss.

Years built

Company started in 1935 and M-System trailers were built through 1960 although they had been boughtout. In 1949 the M-System Manufacturing Co., produced a large (for that time) 33′ long trailer with an indoor bathroom….but as you can see, it was really a glorified showerstall with a stool and small lavatory. Basically, you could ‘go to the bathroom’, brush your teeth and shower all at the same time! Seriously, the problem with this arrangement was that after every shower you had to dry off the toilet and lavatory (and the floor & walls!) before you could use them. So most folks still walked over to the trailer park facilites… Check out how tight the rear bedroom is! The bed is squashed in between the rear wall and the little bathroom. How do you make this bed??? The exterior of the trailer was ver streamlined. The round corner windows in the living room remind you of the windshields of the cars back then. A few other trailer manufacturers (like Spartan) used this type of window also. Unlike Spartan, The M-systems curved front coner windows (called Hollywood Windows) were curved GLASS not plexi glass. The First Company ever to use real glass for curved windows was the Universal Trailer Company in 1947……..M-System started using this idea in March of 1949! and continued through 1950.


  • 1947: Hunter Standard 27′ Special DeLUXE 26’6″ DeLUXE Tandem 27’6″ 1949 Special DeLUXE 26’6″ Suburbanite 33′
  • 1950 Special DeLUXE 26’6″ Suburbanite 33′ 1953 Caravan 24′ Caravan 30′ Caravan 36′ Dixie-Liner 40′
  • 1955 M-System 28′ M-System 36′ -(A,B,& C) M-System 41′ -(A,B,& C) M-System 44′ -(A,B,& C)
  • 1960 Ranchero 40’x10′ Ranchero 44’x10′ Ranchero 48’x10′ Ranchero 52’x10′ Ranchero Dix. 52’x10′ “M” System 40’x10′ “M” System 44’x10′ “M” System 52’x10′ Dix. Metropoliton 52’x10′


1951 M-System Special Deluxe

1951 Vintage Travel Trailer “M Systems”
1949 m systems ad tt mag 49