If the belly cover on your Ameri-Camp is like Forest River trailers use, it's probably a black corrugated plastic material that's held in place with numerous screws.
How heavy is the new electric sofa? If it's heavier than the original, are you sure your slideout can handle it?
2019 Rockwood Signature 8290BS, Reese Revolution pinbox and B&W Patriot 18K hitch
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73, w/ snow plow & camper pkgs.
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)