I found some IC2 Rubber Trees about 200m from my start/base, got some saplings, and made a Forestry Manual MultiFarm with Rubber Electron Tubes. The farm does *not* chop the rubber trees down or re-plant them, but it does harvest the sticky resin. In other words, it's just an automated tree tap. I then auto-feed that into an IC2 Extractor.
To make the "forest" on the Forestry MultiFarm, I plant the sapling, bonemeal it, and chop down and re-plant if it's too small, i.e about 7 or less blocks in height. I then break all the leaves and plant the next rubber sapling/tree directly adjacent to it. The result is a "block" of rubber trees with uneven height. I leave some leaves around the edges to give it a "forest" look so it's not totally game-y.
The smallest size 3x3x4 MultiFarm is more than enough rubber for my needs. Specifically, it greatly exceeds my capacity to use it / match it to the copper from a max-size 64x64 quarry. I probably have enough rubber to match the copper from 2 or 3 64x64 quarries using the sticky resin farm setup described above.