I'm fairly new to this game, too - but I know a little about trademarks.
The question is, has the company trademarked their name? Probably - but remember the fun about Oil of Ulay, where somebody came in, registered the mark, and then hit them with a "cease and desist trading" order? So they changed the name to Oil of Olay, and left the nasty men with nothing but bills ... they were too greedy, those nasty men.
When you register a trademark, you cannot cover all the bases. Every trademark is limited in the field of its application. It depends where the trademark is registered as to how many fields it can cover, but roughly three quarters of the mark defined business areas can be covered by one company.
It is a known practice that the remaining areas can be trademarked by another independent company, whose services can be bought (ie for payment, they will renew their rights regularly, and not use the trademark) - but that is rare, and to make it legal, they have to officially use the mark for something.
If you buy the domain, you could use it - but if you use it to trade in areas where the trademark is effective, you will probably be legally forced to turn it over to the trademark holder for a nominal fee.
Then again, if you use it for purposes unrelated to any trademarked areas, they can't touch you for it. In most of the US, if you have a physical business working this way for a couple of years, it gives you trademark rights, even without those rights being formally registered.
What I would do is register the name, and use it for a purpose clearly unrelated to the trademark holder. If they have "bought insurance" by covering the remaining areas of trade, the "other company" will come in with a "cease and desist" threat - then you have to roll over and sell them the domain for whatever they offer (+15% - always worth a push).
If the main trademark holder find your activities distract their advertising, they will make you a nice offer for the name. Then you might be able to push them a little higher -
Nobody wants to pay lawyers - at the level of law we are talking here, the man who actually makes the threats is charging £500 an hour. So if there is any trouble, it will be very expensive for the trademark holder. They will want a quick solution - just don't get too greedy.
Sometimes, trademark holders don't bother, because the clear separation of activities is enough. For example, in UK no-one confuses Morrisons supermarkets with Morrisons builders.
But if that name is CosaNostraTrucking .co.uk, I wouldn't bother messing with that ...