Sir, you are absolutely correct. I was too eager to blame Fleetwood for not using Fastener Carriage Bolts to attach the retractable step gear - motor housing to the step frame. I bought the 2015 Bounder in 2016 with 4,000 miles on it. I replaced the step motor and controller without issues. Using my RV Mechanic's suggestion of sliding a flat-head screwdriver between the gear - motor housing plate and step frame to create pressure on the bolt head to keep the bolt from turning, I was able to unscrew the nuts off the bolts. However, to install the correct bolts that won't spin while removing the nuts will require removal of the retractable step. Due to the age and mileage of the Bounder, I doubt the retractable Step housing has ever been removed.
Thank you for your response.