Hollow-wall anchors(1/8") work for me. Just remember to use a short screw to insert and lock it into the paneling - then use the OEM accompanying screw to actually mount what you want. Otherwise you risk punching a hole through the outside wall.
Do not cheap-out. Buy the best quality you can find, the cheapies will not hold to the paneling while inserting.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln