Anyone know their max loading?

 

How bigs your baby

 

Don't have 1. Want to anchor something else to them, but dont want it smacking me in the back.

 

Well, if you think that a baby seat weighs maybe 10 kilos for a really heavy one, and the seats take kids up to 30+ kilos, then I would have thought that you would at least be fine for 50 odd KGs in a crash situation.

See this chair (weight 9.9Kgs, kids up to 36kgs) ...

Concord Transformer XT - Bamboo (Bamboo/Black) : mothercare- Nursery Equipment, Maternity Clothes & Baby Shop

To be honest, the isofix points look pretty stable and you'd have a job pulling them off with any weight you could fit in the back of the car