Had the MaxxRaxx towball type carrier and constantly worried about cornering when towing(damaging bikes and/or caravan). Was also worried about noseweight. So, although still use it solo (great carrier) we now carry the bikes on the roof when towing.
If you could get your carriers fitted far enough back on the A-frame it may well be feasible. Why not load up and fit the bikes temporarily and check the noseweight.
If it's smallish kid's bikes then size and weight are in your favour for both cornering and noseweight. Fixing may well be problematic if the chassis maker does not allow drilling (like Alko eg), so you may have to devise a clamping method.
I wouldn't worry about crosswinds as the force will be very much less than the force exerted if they were on the roof! On the A-frame the bikes present a low surface area to crosswinds.
Hope you solve it, as the kids need their bikes on holiday.
Jim
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