Any tips to entertaining kids on an 8 hour car ride?
13 month old and 3 year old.
It's hopeless 
On a serious note. I did that a couple of times on 10-15 hour trips.
#1 the driver is the one that has it easy. Let your wife drive for most of the way.
#2 videos and videogames made the kids cranky after they finished watching/playing whatever it was (at least by me). Use it only when they already are cranky not just bored. And dont stop a video/game in the middle. That's just asking for the kid to start crying. Try getting kids story CDs or download on your phone and connect to your car.
#3 obviously stop off at rest stops for a couple of minutes
#4 have your kids dress in their most comfortable clothing (something like PJs) so they can nap easier.
#5 get one new toy for them to play with (preferably the same so no fights should break out). Something like those stretchy sticky hands that stick to walls would be something that will keep them entertained for around an hour. Coloring book with crayons...
#6 food and some nosh
