Wouldn't another set of rollers further up the trailer help center the front when recovering?
Remember that when your're picking the boat up, the trailer is angled downwards as the boat comes onto it, so all the initial contact is towards the front. I have a bunk trailer, and the bunks run the full length of the hull (to the upsweep at the bow) so running the boat onto the trailer puts the hull between the bunks and largely centers the boat to the trailer. As you pull the trailer from the water, the hull nestles down between the bunks and self-centers as the stern drops onto the trailer. That pic doesn't look like it would do that.
To be honest the pic also doesn't seem to have a lot of support for the hull - I prefer spreading the load out a little more (and I've got an aluminum hull.)