Not that I've ever noticed. I've played the game through about eight times as various characters and encountered little difficulty even with the pregenerated PCs. I'd say create one of your favorites and have a go at it. One thing you will discover with Car-Arcanum is a large number of new charms which are horribly over-weight but are useful at times - electrical resistance, strength boost, beauty, etc. But to counter that, Chris added antigravity diamonds - each one negates 10,000 stone. Just the same, perhaps go with a strong PC for your first time. As for the CAR: it is a woman who was magically transformed into a car. While as a machine, she has tremendous carrying capability, and you have a safe place to sleep in dungeons, sewers, and wilderness. After she turns back into a woman, she becomes a nicely powerful mage with summoning powers. So the PC's carrying strength isn't quite as big of an issue as the stamina needed for the more difficult additions to the game. Enjoy!