We do have a few options for you to choose from to replace the single step on your 2017 Keystone Springdale 245RB.
Out of the available choices I recommend either going with the SolidStep Manual Fold-Down Steps # LC791572 which mount to your threshold or, if you want the same style step, the Hickory Springs Manual Pull-Out Steps # 95324EXTALC1 and using the Outriggers # LC301704 to relocate your mounting brackets.
You are correct that there are no steps with mounting brackets 26"... view full answer...
No, you do not need to remove the screen protector on your door after you install the SolidStep Manual Fold-Down Steps for 25" to 28-7/8" RV Door Frames - Triple - Aluminum # LC791572.
You can see in the video I have linked in the first ten seconds he opens the door and none of the screen door hits or needs to be removed for normal operation. view full answer...