Little clarification here, most of this requires two steps, impeachment and conviction. He won't lose any of that if you impeach him, just like he didn't already lose it for being impeached. If the Senate convicts him, however, he will, at least partially. He won't get his pension at least.
On the travel allowance, I don't think that's a thing. They do get SS protection for life, which is an expense, but I'm not sure he actually would lose this if convicted. This falls under the Former Presidents Act. It would be interesting to see the government argue the case on if he's "former" if convicted or if it is kind of like annulling a marriage, but it isn't guaranteed.
Also, I do not believe conviction keeps him from running again, at any level. As someone mentioned earlier, my apologies for not wanting to sift through the find the post, Congress would need to draft something up specifically to keep him out of office. At first I thought this may be triggered if he is convicted of a felony, of which he'll have plenty of opportunities to defend against once he leaves office, but I don't think that would automatically trigger the inability to run again either.