How heavy are the four bikes? Although you don't need a lot of noseweight for a small trailer* remember it's the total of that plus all the bikes plus the rack. Some cars (e.g. Ford Focus) only have a 50kg noseweight limit - check your towbar plate and car handbook to check what yours is.
Aim for 7% of the laden weight of the trailer as noseweight, so even if it's only 200kg loaded that's 14kg. If the rack weighs (for example) 4kg you could be limited to as little as 8kg per bike - unless a couple of them are small child's bikes that's going to mean very lightweight models!
Personally I thinkt he best place for bikes when towing is on the roof of the car!
Glen
*Due to letting someone else load and hitch up for me I once towed a Daxara with no/negative noseweight. I was only going about 5 miles and nearly stopped to redistribute the weight it was so bad!
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