I contacted the manufacturers of steps and unfortunately no one has a 3-Step option that fits your 25-1/4 inch mount on your 2018 Forest River at this time. Most 3-Step options have different mount sizes with 27-1/2 inch being the more common sizing. I have attached a link to our 3-Step inventory department.
I do have a 3-step scissor option by Torklift that is Item # TLA8103 that is close but it's mounting dimensions are 25-7/16 inch wide by 12 inch deep.
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The Forest River trailers that come pre-wired for camera systems are intended for use with the Furrion brand products like # FOS43TASF. This is their RV Wireless Observation Camera System with Monitor and Bracket. Its Plug-and-Play design works with pre-installed mounting kits that provide operating power for the camera. view full answer...