The Muggy has a flat truggy chassis (hence the name = part MT, part truggy) that bends very easily. Bracing is a must. I tied the front and rear bulkheads of mine together with a long piece of Al angle - works great.
The muggy doesn't have "good" chassis braces like most other truggies. Hence the need for custom stuff. When I bought the muggy roller, it had this 1/2" x 1/2" STEEL angle running from the front bulk to the back bulkhead!
Losi 8T 1.0, Savage Flux - XL style, LST XXL, Muggy, 3.3 E-Revo Conversion and sitting outside 425hp, 831 Tq Dodge Ram Turbo Diesel. It SMOKES