As choplee says, campers are OK.
Useful general legal stuff from the Caravan Club site:
http://www.caravanclub.co.uk/planning-y ... uirements/
and specifically about bikes:
"Bicycles may usually be carried on the roof of a car, provided they are attached to an adequate roof-rack and the total height does not exceed 4m. However, the cross-Channel operator will need to be advised in advance of the total height of the vehicle as this may affect the cost of your crossing.
Bikes can also be transported at the back of a vehicle provided they do not obscure lights, indicators or number plates. Bike racks can only rest on the tow bar if the maximum weight allowed on the tow bar is not exceeded.
Portuguese regulations stipulate that bicycles may not be carried at the rear of a car, but they can be carried at the rear of a motorhome or caravan, provided that they do not extend beyond the width of the vehicle or more than 45cm beyond its length.
In Spain and Italy any overhanging loads must be indicated by a square panel measuring 50cm x 50cm with reflectorised red and white diagonal stripes which can be purchased from Fiamma stockists (
http://www.fiamma.com). Panels are available in aluminium and plastic and in Spain you can use either however, in Italy the panel must be aluminium."
A couple of bikes and the carrier are well inside the tow bar limit of the Cali by the way
Chris