Expensive Motorhomes Which Class C Motorhomes Are Built With Aluminum Or Steel Square Tubing And What Year Can I Go Back To Get 1?

Which class c motorhomes are built with aluminum or steel square tubing and what year can I go back to get 1? - expensive motorhomes

I am looking for an RV Class C is cheaper to build out of wood instead of metal. RV majority have had leaks, so I want to avoid costly structural repairs to avoid the purchase of wood structured RV.
There may be a Class A or C, the capacity for 6 or more.

Thank you!