Have you ever used a baby gear rental company? What did you rent? Something like this: http://anythingforbaby.com/
We are renting a house for Christmas and I was thinking we'd have to pack the PnP in a giant suitcase, but DH found this-- only $38 to rent a pack and play for the week.
If you've used one, what did you rent? Were things in good condition? Would you rent a car seat, stroller?
Personally I'm wary of renting a car seat, plus, how would we get to the airport? And if we take the car seat, I feel like we would want the snap and go base for it anyway. But the rest of the stuff might be a good way to see what she likes for things like jumparoo/exersaucers and stuff. She'll be almost 5 months when we travel so really I think we just need a place for her to sleep, and a place for her to sit and chill with us.