New 5th line coming, no wood all ALU, from livinlite

rhingst wrote:
The undercarriage frame is steel which is what you would want in a fifth wheel. An aluminum frame would have lots more flex and end up being a problem. The only 2 good things about aluminum is it's light and it won't rust. But it's also brittle and in an atmosphere like where we are from south of Houston I have seen holes pitted completely through aluminum.

I would disagree with this statement. I've seen quit a few horse trailers and animal carriers that are fifth wheel aluminum. If you want to see holes and pits just look at a steel frame trailer that lives it's life in northern damp climates. Aluminum is the material of choice when building a trailer and the only main reason it's not used more is because of the increase cost.