Well, you don't say what year/or model trailer you are considering doing this with (I assume vintage), but no, it probably wouldn't work to reverse your panels.
We took all our panels out of the interior of our '56 when we did our restoration a couple of years ago - the panel backsides are not great. There are scratches, writing, corrosion & sealants on the backsides. You would also probably have a problem with rivet holes lining up as well as other cut-outs like storage compartments, windows, outlets & misc. holes depending on the layout of your trailer.
We ordered about 4'x30' "roll" of new Alclad aluminum
for replacement of a couple of panels on our '56 Safari (interior & exterior), our '64 GlobeTrotter and a friend's '64 GlobeTrotter. We used the old panels for templates for the new ones. It worked out very well
- we transfered all the rivet locations and other openings onto the new panels. We ended up re-Zolatone'g our interior panels, but if we were ever to want a "shiny interior" we would definitely replace the panels rather than strip or flip them. A whole lot less work - and faster.
The new aluminum was not horribly expensive( $16.75 lf x 4' now)...it's the way I would go, besides the cost for all the stripper would be almost the same as replacement panels. The only panels I would go to the effort to strip would be the compound curved corners (again, depending on your year) as they would be more cosly to replace than flat panels.
We ordered our aluminum from Airparts
Good luck in whatever you decide to do.