I went out to the warehouse to see what size box we ship the Econo Porch Trailer Step # EHS-102-R in and found it to measure about 35" x 47-1/2". As far as disassembly goes, once you remove the handrail the stairs simply collapse. Since the stairs come as one piece I don't advise trying to break them down any further than what they ship out as.
Attached is a photo of what comes in the box when you receive it and the instructions that are included. This is as far as you should go when... view full answer...
If the mounting bracket width you have is 25.5 inches like you mentioned the # LC432690 that you referenced would be what you'd need. This would match up to that perfectly and would put the lowest step 25 inches from the RV frame. view full answer...
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