As Cuzdog said, you will probably be able to use the handlebars to attach the forward tie down straps. The type of chock you get will have a lot of bearing on how much pressure is on the straps. I use the Titan brand chock. A little on the pricey side but has a cam-operated cradle that locks the front wheel in place and holds the bike pretty firmly in the upright position. There are other brands available that do the same thing. Because the bike is held upright by the chock it requires little pressure on the straps. With very minor fork compression the bike won't move at all.
Since there is minimal pressure on the straps hooks, it's best to use something like the Load-All straps which have a safety hook integrated to prevent the hook from detaching in the event the compressed load is released (i.e., a panic stop or accident which could allow the forks to compress, which in turn could allow the strap "s-hook" to come loose (don't ask me how I know that but I promise you it can happen).
Since I need minor fork compression I have the forward straps attached to the floor rings well forward of the front axle. Then, by having two additional straps extending from the luggage rack brackets to the aft-most floor rings, the forward and aft straps are pulling against each other, which works well for rapid deceleration and acceleration (although I'm sure rapid forward acceleration is not very common while pulling the trailer).
Rear straps become less important as the trailer weight is increased. If you're moving your bike on a landscape trailer I guarantee you the back end will move left or right until it hits the edge of the trailer. As the trailer gets heavier there is less "bouncing" so rear tiedowns become less important. It will never hurt to have a couple of straps in place to keep the rear wheel from bouncing.
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.
Vengeance 25V (the Harley needed a home)