Some time ago I writed LWP::UserAgent subclass, which main purpose is to automate proxy rotation for each request. It is not finished, not well tested and not documented yet, but you can try: LWP::UserAgent::Proxified
Simpliest variant of usage: 
use LWP::UserAgent::Proxified;

my $ua = LWP::UserAgent::Proxified->new(
  proxylist => [
      ['http', 'https'] => 'http://10.0.0.1:1080',
      ['http', 'https'] => 'http://10.0.0.2:1080'
  ],
  proxyrand => 1, # choose random proxy for each request
# other lwp options goes here
);

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In reply to Re: Proxy link rotation by OlegG
in thread [Resolved]Proxy link rotation by kazak

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