Ours is a fully break proof module with one part attaching to another giving it strength and light weight. The arched roof is our main point, increasing the strength of the module. The roof is molded on the exterior, the back, the top and internally at various structural points. The side rail design that ties everything together makes it a very strong module. The main highlight of the Braun Ambulance is its solid body construction, it is a fully break proof module with one part attaching to another giving it strength and light weight. The module is put through several tests besides the curb roof and side rail design that ties everything together and makes it a very strong module. The next is the Mode Wire where we strategically place the wire harnessing and PDQ installation. This is where we have our Master tech 3 multiplex peer to peer system, which reduces downtime and eliminates mechanical parts that have high failure rates. Call us today at 800-392-7233 or Visit Penn Care Inc. 1317 North Road Niles, Ohio 44446, http://www.penncare.net