BS is an abbreviation for 'bullshit'. Bullshit is counted as swearing and is deemed to be a rude way to say 'lies'. In this context it is probably used as the image being portrayed is a woman who doesn't care about other people's opinions. Tough as old boots! Tough to the point where she will use the word 'bullshit' without caring whether it offends anyone.

An upcoming model is a design based on something that already exists that is due to be released. E.g. You may have a new upcoming model of the iPhone (iPhone 7). iPhone's already exist, however iPhone 7 is a new 'model' (new design) which is upcoming (coming in the future). Camouflaged means to hide something. Prototype means the 'pre-product', a trial for the product so to say. In this context it's saying that a lot of the upcoming models of cars are being subtly released into the market without consumers knowing. This essentially allows the companies to get a gist on how the public will react to certain aspects of the product before it is released. It gives the companies chance to alter certain parts of the 'upcoming model' (alter their product before release). 'People hauler' in this context means a car. To 'haul' something is to 'move' something usually with great effort. Therefore a people hauler would be something which will move people, in this context a car. This article says that the company is about to release a car called the crossover. I believe the gist the article is trying to get across is that the company has so much confidence in their product that they have skipped the prototype stage (where they have a chance to alter it) and gone straight into production. I don't know much about cars, but that's what I gathered from the article! I hope it helps.

I've never personally read the book but going by what you have put, I would say the following: To be 'on someone's ass' means to be 'hounding' them. I realize in my explanation I have just used another idiom. Let me give an example: Say you've got a deadline approaching in your workplace for which you have something to submit.. The boss may be visiting you every 2 minutes asking "Are you nearly done?". This would be an example of 'hounding', or 'being on someone's ass'. As for the meaning of 'cracked', in this context it could be exchanged with the word 'joked'. To make a crack about something, essentially means to make fun of it (make a joke). I hope this helps!

I've never personally read the book but going by what you have put, I would say the following: To be 'on someone's ass' means to be 'hounding' them. I realize in my explanation I have just used another idiom. Let me give an example: Say you've got a deadline approaching in your workplace for which you have something to submit.. The boss may be visiting you every 2 minutes asking "Are you nearly done?". This would be an example of 'hounding', or 'being on someone's ass'. As for the meaning of 'cracked', in this context it could be exchanged with the word 'joked'. To make a crack about something, essentially means to make fun of it (make a joke). I hope this helps! (I realize I posted this in the comments section, I will move it to the answer section!)