I hope you realise ,that placing 2 bikes on the A frame will really reduce your nose weight ,the Alko nose weight max is 100Kg ,minus the weight of your bikes
Following on from the previous post, dont forget you have a max noseweight limit set by the car manufacturer, which in a lot of cases is about 75 to 80kg.
Many continental caravanners use "A frame" mounted bike rack but what must be remembered is that with many continental caravans it is sometimes difficult to get the noseweight high enough, unlike UK vans where it is difficult to get the noseweight low enough.