Lonestar has a strong frame, cross member suport and steel floor pans, I think it is a stong frame and has a sturdy copnstruction, however I agree with others to your question as things will happen. Take a look at the lonestar web site and you can see the construction of the frame, dropped steel floor pans and a rigid solid steel construction all powder coated too. Some others are running an additional flat sheet of SS steel along the bottom to reduce wind drag but you can use this for additional protection. There also is a thick fibreglass floor pan insert for comfort and additional support for the body.
www.lonestarclassics.com or check out my photos.