Depending on the application, there are a number of nice add ons. The basic trailer is the M200. Rarely seen any more. The M200 was without fenders, but with the rear legs to prevent the trailer from tipping over backwards. They started to go away in about 1970-71. Then came the M200A1. The only difference was fenders. All the other add on we're specific to the gen set mounted on the trailer. The sledge bracket, ground rod compartment, various cable reels, mounting brackets for PP, (Power Plant) cables, Distrabution boxes, fire extinguisher brackets and my favorite, the work platform in the rear. As I am only 6 feet tall, working on or in a gen set control panel, requires a ladder or several empty beer cases to do so. The work platform made that easy! In the 1990's, came a new front jack leg. The old one was more robust, but was so long out of production, it was no longer repairable. Well, other then stealing one, or finding one on the side of the road. This often happened due to lazy soldiers not securing the Jack properly. When the Jack hung up on something while underway, it sounded like an explosion.