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ATO Scripts' ATO Trade could do ten.. but both the site and Tue have disappeared.
If you are trading w/ your own sites and / or VERY trusted partners only you could use Gallery Booster (an all in one tgp script / trade script - just don't use the tgp features). Trades are sent strictly based on raws and there are no real anti-cheat feaures so there is great potential for cheating.
There will a new multi-site version of CJO coming out soon, but if you know a little bit of history, you'll be banned from trading with many sites.
With AT3 / ATX you can setup a "main" installation and tie other installations into it, so this might be your best option.
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