I am not an expert but this is what I have done. By small dents I think of a dent caused by hitting the sideing with a car door. Those I left. Big dents I replaced the sideing. It really is not hard. Rv shops do it, have you checked any for costs.
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.