I would not even buy that for storage use only.
Get 80+ watts and a decent controller for best results.
If you expect the solar to recharge the battery while camping I think you need closer to 200+ watts or 50w to 100w per battery.
Forum Members Solar Installations With PicsHere are some panels to compare price.Before you buy make some cardboard templates the size of the panels. Get up on the roof and make sure they fit. Need to have 12"+ from things that give shade. Check shade at 9a and 3p. Even one cell part shaded can reduce the panel output significantly.