What is wrong with your ladder? If it is bent on the straight parts then you can actually mend the ladder and it looks and works just fine. This company supplied the ladders for National RV for my year a 2003; the replacement however is non standard and requires manufacture and shipping. It is expensive.
RV Accessories, RV Products
This company sells ladder parts. Several of us have procured parts here and repaired a bent ladder inexpensively.
A good pipe cutter is a required tool for doing a good job, I also used a rivet gun one of the simple ones from any good hardware.
Several of us have repaired the ladders and can kind of walk you through it if that is what you want to do.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)