Hi Robbo
We used Chappelle for three years in early 90's - like a lot of sites, probably changed a bit since then, but....
Location: Infield of 24hrs circuit, sandwiched between Dunlop Bridge area and Bugatti circuit.
Atmosphere: Was always friendly, good mix of nationalities - all motorhome/RV parking. Very noisy, being so close to the track. Constant foot traffic through the site, as it's the main thoroughfare to Garage Vert and Houx Annexe - problematic as the site is used as a convenient 'field toilet' by those passing through. Much of the site is not level (not good if you're in an RV) and it's very dusty, if it's dry.
Typical concrete-like ground - you need a 'lecky screwdriver to drive in tent pegs.
Toilet Facilities: Basic - and used by the whole world - so nasty after day 1.
Facilities: Plenty of stand-pipes, no electrical hook-up (then) and no showers - but as it's intended to be an RV park, not too important.
Footnote: site entrance is slightly tricky, first time you use it (not easy to find).
Pro - Convenient stumble back to your tent/motorhome. Close to the action.
Con - Uneven ground, ridiculously loud, too much passing foot traffic. Smells of piss on Sunday morning!
