Sorry, no pictures of the installation on my Trailmanor. I just went out and looked at the axle mounts on my Rockwood 2901SS and it is a little different than what my Trailmanor was but I think it could still be lifted the same way. Good thing is there are no welds to cut. Below is a very fuzzy picture I took of the brackets to help explain how the lift would work (sorry for quality, it's dark out right now).
If you unbolt the axle from the bracket on the frame and jack up the trailer you can insert a piece of aluminum or steel the proper thickness to get the desired lift. There are slotted holes in the bracket on the axle to use to bolt thru the axle bracket and trailer frame. You would then re-drill the bolt hole in the trailer frame bracket thru axle bracket and re-bolt that connection. (reference the notes on the picture in the attached .pdf file)
If this makes no sense let me know and I will try to sketch up something and scan it in to attach.
I am located in Wauseon, OH (30 miles west of Toledo right off of 80/90) if you want to arrange a trailer "modding" weekend.