Hello acbruce
Before we consider the bikes, lets get some facts an legalities sorted out about nose load.
If you are trying to get a level outfit, then you are likely to be ignoring the legal requirement regarding nose load. Aesthetic appearance of the outfit plays no part in the safety or legal measures.
The prime requirement for nose load is to create an outfit that will tow safely. There are some legal limits that must be observed.
The nose load must never be less than 25Kg or 4% of the trailers weight which ever is greater.
The nose load must never exceed the car or the caravans specified maximum nose load value which ever is smallest.
It may not be obvious but the nose load that a trailer applies to the tow ball varies with its height above horizontal ground. For that reason the nose-load must be measured with the trailer hitch at the same vertical height from the ground as when it is attached to the tow vehicle - all these checks must be done with the outfit on level horizontal ground. Slopes will affect the measurements.
When hitched and ready to tow The vertical height from the ground to the centre of tow-ball must fall between 350 and 420mm
Nose load should be adjusted to provide a safe tow. Generally speaking most towers find that using a nose load towards the top of the available range works best.
It also should be mentioned that cars have load limits on boot load, roof load and axle loads, and again it is an offence to exceed any of them.
Check these out first and then see where you may be able to carry your bicycles.