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I also had a resection and gallbladder removal, but had a lymph node involved that was removed and another tumor that was just burned (other side of the liver from the resection). I was on Gemzar / Cisplatin as well as Xeloda and Oxalyplatin together. I tolerated both regiments very well. BUT I did not have radiation therapy and actually should have. My tumors have returned and NOW they may decide to do radiation thereapy (hoping for Proton light beam therapy).
You didn't say if you had any lymph node involvement or if there were other tumors. My doctors insisted that they got "clear margins" around everything (resection, lymph node removal and burned tumor), but they returned and have metasized to my lungs. Ask your doctors about why they want to do radiation. I would highly suggest doing as much as you can before the liver regenerates and other organs move into the area again. My opinion (and I'm not a doctor by any means), is to hit this cancer with everything to keep it from coming back. Once it comes back, its a different story.
Absolutely check our search feature to see how many have experienced radiation, and the 3 chemo meds you mentioned. Everyone reacts differently to things though, but at least you can see what you might expect.
"Life is not about waiting for the storms to pass...
it's about learning how to dance in the rain."