We have a small RV with modest electrical needs, probably less than 30 amp-hours a day in summer for just lights, fridge and fan.  We often boondock for 3 days with no charging with two batteries.  I bought a 100 watt solar kit from Renogy last summer but didn't get it installed until near the end of August so no camping experience with it yet.  The most charging current I got out of it was one amp, due to the batteries being close to fully charged and the low angle of the sun in northern Alberta.  I am hoping the 100 W solar will extend our boondock duration by a day or two.
This is the kit I installed: http://www.amazon.ca/Renogy-100W-Mono-Bundle-Monocrystalline/dp/B00B8L6EFA/ref=sr_1_7?ie=UTF8&qid=1420407753&sr=8-7&keywords=renogy
Mounting the panel on the roof was difficult due to a shortage of wood in the ceiling to attach to.  The electrical install was just two wires from collector to controller, and two more from controller to battery.  No trouble after I discovered the fridge vent route for wires from the roof.