Camping in Majorca - Majorca Camp Sites The Balearics is not known for its camping as very few people camp on Majorca. You can camp on unauthorised sites but there are exceptions such as millitary ground, towns, farmland and tourist beaches.
There are however a few official campsites on Majorca such as... Club San Pedro Address: near Arta
Telephone: +34 971 589 031 Camping Platja Blava Address: Within walking distance of the S'Albufera nature reserve
Telephone: +34 971 537 863 Campamento Hipocampo Address: Ctra. Cala Domingos, s/n 07689 Espinagar, Spain
Telephone: +34 971 833 715 Lluc The Lluc Sanctuary has two sites available - the new Font Coberta campsite is at the end of the old road to Lluc, next to the main car park. There are washrooms with showers (cold water only) cooking facilities and pitches reserved for the disabled.
Alternatively there is the old Margeno campsite next to the junction of the Inca and Pollenca roads is reserved for caravans and as a recreational area for picnics, children's games etc.
Address: 1, 07315 Escorca, 07315 Lluc, Majorca, Spain
Telephone: +34 971 51 70 83.
But like you say, plenty of stables for the horses
Winnebago. 
Doesn't sound very promising:-