- The largest stage in the SL family & our most popular mobile unit.



Becoming more popular over the past few years, the SL-320 is the largest stage in the SL family. Its high wind resistance and large load bearing capabilities make it a great choice for almost any festival or concert. Being used by touring acts around the world, the SL-320 has proven itself time and time again.

With additional roof supports and a stronger roof grid, the SL-320 is more than capable of holding the heavy loads that larger size acts require. And like all of our SL models, the SL-320 allows a timely setup with fewer hands than a conventional stage of its size.

OAR Alfred University / SL-320
Electric Forest / SL-320
Pocono Downs Summer Series / SL-320
Rivalry Fest / SL-320
Gettysburg Bike Week / SL-320
Washington, DC / Shamrockfest
Athens, OH / Numberfest
Baltimore, MD / Pimlico Raceway


Featuring a roof with a 26,000 lbs capacity, the SL-320 is capable of holding some of the most intricate lighting rigs and, like the other models in the SL line, has several built-in rigging points along its roof capable of holding 1,000 lbs per point. With incredibly strong sound wing extensions, up to 4,000 lbs on each side, the SL-320 can handle full-size line arrays that are standard for larger acts.

Standard on the SL-320 are 16'(w) x 16'(d) stage extensions that can be used to increase the performance area, either as a monitor mix with ample room or as additional speaker supports. Mountain Productions' available custom weather protection encloses more than half of the structure and is arguably the best in the industry and second to none in protection.


Performance Area

Stage Height

Upstage Clearance

Downstage Clearance

Trailer Length

Trailer Width

40' x 40'

3' 6" to 6'

22' 11"

25' 5"


8' 2"


Load Bearing Capacity

Built-in Rigging Points (4)

Trusses in Central Roof (2)

Front Truss (1)

Rear Truss (1)

Side Speaker Points

26,000 lbs

1000 lbs ea

3000 lbs ea

2000 lbs ea

2000 lbs ea

2000 lbs ea