Ye olde loading tricks...
Hi Droopy
Having run a rental business some years ago supplying vintage and contemporary Harleys for film / TV jobs, trailering for us was a daily event. Thankfully I don't do it now...!!! My back still suffers.
You will need as a minimum per bike, 2 x ratchet straps to hold down the handlebars, one either side of the bar clamps. If they have big hooks, they will go over the bars, otherwise I had a pair of nylon strap loops with a D-ring that I attached to each side of the handlebar close to the yoke. I would fit these on each bike first before putting them on the trailer so that I could snap the ratchet strap to the D-ring.
Also, 1 x long ratchet strap to strap across the seat area and down either side to somewhere adjacent to the axle / wheels. Make up a pad to go between this strap and seat to prevent chaffing (folded blanket, piece of foam or similar)
Also 1 x short strap with double D rings to strap the front wheel securely to the trailer at the front. A 2nd short strap for the rear wheel to channel but that was optional on lighter bikes. I would for something the size of an oilhead GS.
If using a single channel trailer and, if you are on your own, (I usually was 'cos nothing evaporates like a film crew once wrap has been called!) you need to lay out certain things before you touch the bike.
Have the trailer fitted to the towing vehicle, don't try it on a loose trailer. Have a loading ramp that can be secured to the trailer, (you don't want that slipping off at the wrong moment) and line the bike up with the channel. A scaffold board will do but get a proper ramp made up to fit.
Next, lay ALL the straps out, where they will be needed and unravel any kinks/knots so they are ready to attach. Have trailer end attached on at least one of the handlebar straps.
For smaller machines you simply run it up the ramp, but, for heavier stuff, full dress big twins or 1100/50GS's, start it up and in 1st gear, walk alongside the bike as it pulls itself up and onto the trailer. Check that the rear wheel is properly in the channel, not sitting up on the edge.
With the bike fully onto the trailer, stop the engine with it still in gear. Whilst holding the bike with one hand, front brake on, reach down and pickup your previously laid out handlebar strap (the one that is already attached to the trailer) and snap it the handlebar.
Adjust the ratchet until it takes the weight and with the bike leaning away from you, held by that first strap, you can now step around to the other side to attach the 2nd handlebar strap.
Get the handlebar straps down snug and compress the front end checking that the bike is upright, not on the piss, then, do up the other straps.
Double check everything before departing and don't forget the ramp. You can unload at a push, but loading with without one is a bugger.
Thats it, - sorry if it is a bit detailed and I don't want to send the forum to sleep, but I think you need to know all this stuff.
It is obvious to those who have done it, but, I have watched people who are very capable riders and pretty useful at practical stuff until it comes to tying a bike on a trailer. Then for no apparant reason, some real crappy securing efforts that are accidents waiting to happen.
For the drive home, I always stopped within the first couple of miles just to check that all was OK. Remember to watch the bike in your rear view mirror like a hawk... oh, and check that you are insured for towing in the car.
Happy towing...
Charlie B