Gretchen - welcome to the forum.
I think you could use a farm jack that you might find at Harbor Freight to lift the corner that has the broken cable. You'd put the jack between the outrigger there and the top half and then lift the top a bit at a time jacking up the bad corner as you go to kind of keep things even.
But, I don't really think you HAVE to lift the top half much to replace a cable, it just makes it easier. You need to take off the interior trim strip at the top of the bottom half (inside) to expose the upper pulley. Then you can crawl under the trailer to thread the new cable over all the pulleys under there and then up the inside to the top pulley and down to the attachment point on the upper half.
- Jack
I think you could use a farm jack that you might find at Harbor Freight to lift the corner that has the broken cable. You'd put the jack between the outrigger there and the top half and then lift the top a bit at a time jacking up the bad corner as you go to kind of keep things even.
But, I don't really think you HAVE to lift the top half much to replace a cable, it just makes it easier. You need to take off the interior trim strip at the top of the bottom half (inside) to expose the upper pulley. Then you can crawl under the trailer to thread the new cable over all the pulleys under there and then up the inside to the top pulley and down to the attachment point on the upper half.
- Jack