Flexco FP 3200 triple steps. I simply upgraded to quad steps on 2013 Forest Stream.
Requires 28 1/8" large room minimum. To be made use of on RV with floor elevation of 36" from ground. Just 4 bolts to install. Require more details or I could send schematics offered online at Flexco too.
Expense 300.00 plus tax obligation direct from Flexco or 700.00 from regional dealer.