We just had our Lippert Solid Step installed and faced the same problem. First company installed it and never tried having the steps down and closing the door. The door wouldn't close. They threw there hands up and removed the door leaving holes in our floor.
The second place said no problem. They checked the clearance above and below the door and found enough space at the top of the door to shift the door up. The next issue was getting the steps turns out they were on backorder we found out after waiting weeks, then More-ryde had theirs in stock. After waiting more weeks we found out our doorway was too think and they wouldn't latch. So, back to Lippert still out of stock. Our repair shop found a shop with a set and got those and we love our Lippert Solid Step!! It works great! So check to see if there is enough clearance at the top of the door to raise the door to give you clearance at the bottom of the door!