Wife and I carry 2 mountain bikes on the roof rack, and they each weigh 24lbs (10.9kg), so that's a total of 21.8 kg, roof load limit is 40kg, the Ford 2 cross bar system is designed for that weight, so no problems there.
Its all a question of roof loading and that rather ackward sideways opening rear door.
Solutions boil down to....
1....Three bikes on roof rack (if it meets loading)
2....Or two bikes on roof rack and one on rear door carrier
3.....Or one bike on roof rack and two on rear door carrier
(anymore bikes on the rear door carrier is questionable if more than two bikes, due to Ecosport side opening door creates a weak loading and could affect side hinges, so it will not carry the same weight as a vertical hinged tailgate). Above is based on two adult bikes and one kids bike, so its down to weight.
Here is a thread about roof loading.....(note roof load limit is 40kg, as thread title is misleading)
http://www.ecosportownersclub.co.uk/forum/23-technical/3529-roof-box-maximum-load-20kg.html
Hope that helps. its a pure mess with that side opening back door. Thats why I used the roof rack
