Cars probably do get hot. What are you planning to pack that might melt? If it is food, you could pack a cooler with lots of ice in your car and that should keep things un-melted for at least 24 hours. Or, buy the food when you get to Florida. You have your car, after all! Yes, I bring pillows and a light blanket per person on the train (we go coach). It isn't like a plane, you can kind of bring a lot on to the train with you. I do limit us to two bags per person, but at least one bag is pretty big (the XL LL Bean bote and tote that I shove our blankets and pillows into!). We each have a backpack/carryon type bag with our toothbrush, change of clothes, books, electronics, etc. I have the big bag with pillows and blankets and then usually a snack/soft cooler bag. I like to take some of our own bottles of water, sodas, and snacks on the train. Not everyone does, to each their own. Oh yeah, bring all of your plugs/chargers for things with you on the train. There are outlets at the seats. You dont' want your iPad battery to die halfway to Florida and not have the charger! The blankets can be used to stay warm, to make the seats more comfy, or to block out light if you end up with the crummy seats by the bathroom stairs (check in early to avoid these seats!). We got the upper seats by the stairs last trip home and I hung our blankets from the overhead luggage rack to block out the light. Worked like a charm! Made our seats like a little cave! I'm sure I'll think of more tips later!