I think your professor has been a bit unreasonable here- traveling an hour each way is a lot, and some people do have other commitments that may make this difficult. If this will be expensive, then again he's putting you in a difficult situation. However, if the other guys were actively rude, this is not OK either- it's one thing to say "**** that ****" but another to be rude/aggressive towards you. If they are actually being aggressive then I think it's fine to raise the fact they had an extreme reaction towards you with the professor, and share that they made you feel uncomfortable- that's not ok at all and he should step in here.
If they weren't actually aggressive, I'd suggest sending a group email saying something along the lines of:
"[Professor] has suggested we do X/Y/Z. I know when I raised this with the group, some people weren't keen. Can I ask if it's the cost or time that's an issue and why, so that I can raise this with him?"
You may find one of them is in financial hardship or has caring responsibilities or can't do this for some other reason, in which case I think it's fine to go back to the professor and say "what you're asking isn't really reasonable, because X. What are some alternatives?"
Alternatively, could you find a way to make the work a fair split without everyone doing the same thing- if you did all the traveling, and they did all the editing (for example), would this work out as a roughly even time split? Do you think this could be a potential solution? Again, maybe suggest this via email and see what they say?
Try to keep things to your uni emails, so if things really do go tits up, you can easily forward stuff on to your professor.
I do agree with others that it's worth thinking about the cost/benefit- e.g. one day trip may make a big difference to your grade, but extra shorter trips may not be that worthwhile.