You should see four bolts in front of the tire on the left hand side of the trailer. These will each have two nuts on the outside and if you look inside, you'll see the cables attach to them. Tightening the proper nut will pull the bolt out, which will raise the low corner. (The outer nut is just a lock nut you should tighten down once you get the cable adjusted.)
The two front bolts are moved out to raise the front of the top half. The top bolt is the Right Front, the bottom bolt is the Left Front. You lower the top onto 4 2x4s to take the tension off the cables to make the adjustments.
The complete directions can be found in this link (along with information on replacing the cables, if that need should arise):
http://www.hilotrailerforum.com/atta..._1998_24td.pdf
It says it's for a 2005 model, but the description applies to most, if not all HiLos. Look at pages 4 and 10 for the adjustment points and adjustment procedure.
There are many Owners Manuals in this forum too:
http://www.hilotrailerforum.com/f49/ You may find yours there.
- Jack