It's really hard to say because you can't predict the kind of symptoms you'll have by that stage of your pg. I went on a long, overnight drive interstate when I was about 28 weeks along. I found the ability to stop regularly for the toilet as well as to walk around for 5-10 mins really helped. I got very uncomfortable sitting in the same position for too long but a pillow helped me shift position in the seat if that makes sense.

I reckon you'll know as you get to the end of your 2nd tri if you can do it or not and whether you need to bring your trip forward.

HTH.