The only way you will make those segments look "good as new" would be to remove them from the trailer and either replace them with clean segments from a donor trailer (since you can't buy them new anymore), or find an "artist" with an English wheel and have them work the crinkles out. If you pay someone else to do all the work, figure $1-2000 per dented segment.
If you are willing to put up with some impefection, then by all means, try the suction cups, the hot glue based pullers, etc., and see if you can get to a level that you can live with. There are many threads discussing the various "paintless" dent removal techniques, and some folks have done fairly well with them.
good luck!
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