There are plenty of hotels, B&Bs, and holiday apartments in Lanersbach. The website of the Tourist Association (Tourismusverband) has a search engine that you can use to find accomodation. Although there is plenty of space in summer, you shouldn’t leave this until the last minute.
For those of you who insist on camping ;): There is no official campsite, but the Tourist Association has promised to help me to organise something if necessary. If possible, try to book something else, but if camping is a requirement for you, please contact me in advance (firstname.lastname@example.org) and I will see what I can do.