Have a look here.
Pulling a trailer with a motorcycle
http://selil.com/archives/33Hints: towing & loading trailers
Loading your motorcycle trailerLoading a trailer is not totally unlike packing a suitcase. It sounds rather obvious, but pack the trailer evenly to distribute the weight, with heavier items at the bottom, and put items you may need easy access to at the top.
Fill any spaces with softer items, to achieve a uniform load and stop items shifting around too much.
Don't put heavy items on the lid of the trailer, and make sure everything on the rack or Esky tray is securely fastened.
From a technical standpoint, you're aiming for an evenly balanced trailer with a slight (10%) weight bias onto the bike tow ball. That means you need slightly more weight at the front than the back. Too much weight bias rearwards will be trying to lift the back of the bike, and too much weight bias forward will be trying to push the back of the bike onto the tarmac! It's all common sense but very important to bear in mind to ensure you tow your trailer safely.
Using your trailerWhen towing a trailer, make allowance for the extra weight, length and width when manouevering, pulling out into traffic or braking. That sounds all too obvious, but you don't want to forget the trailer is there - doh!
Allow extra braking distance if towing a heavier load
Adjust the trailer tyre pressure to suit the load. Typical tyre pressures are between 20-25 psi, so if you have a very light load a pressure closer to 20 psi would be suitable
If towing an empty trailer, try putting something in it if possible, to settle the suspension for a smoother ride.
------------------------------------------
The tyre pressure will depend on the type of suspension as well. Classic Industries (1st post picture) uses a torsion bar and the tyres act as shock absorbers as part of the set up so they recommend 12-15 psi for theirs.
If you've towed a trailer with a car before then you're half way there. The basics apply regardless.
The towball/coupling height from the ground should be the same height as the rear axle is when you are sitting on the bike.
----------------------------
I haven't had any bad experiences with the two trailers I've towed with my 1100.
Most of the time you won't even notice you have one except when moving off.
Filtering, don't even go there but keep your escape route options in mind while in traffic.
You will use more fuel but I find the 90 to 100 kph range gives me about 16 km/L average.