Those OEM bunk ladders are just atrocious!
I took a cheap aluminum step ladder, dissected it to remove everything except the steps, carpeted the steps and had a comfy ladder for the bunk. A 2X4 fit perfectly into the end of the ladder and I angled one edge of it align with the edge of the bunk.
2015 Greyhawk 29MV
Honda CRV toad with Blue Ox baseplate
Ready Brute Elite towbar with braking system
TST 507 Flowthru TPMS