You cab safely assume that whatever they offer it is to their advantage-never yours. I was in the heavy truck industry for 30 years and have bought and sold 18 wheelers etc. I always showed my customers what their vehicle was truly worth whether it was what they wanted to hear or not- reality is reality.
What many car dealers do is win on both ends. For instance, let's say your Trax is worth wholesale-remember that is the most they will truly pay you is $12,000-wholesale in the blue book- they of course find every little nick to downgrade it to average condition.
They have a new vehicle on the lot for say 35,000 list price- which is is BS price used by manufacturers. They may have real dollars say $31,000- that is an example of what the invoice from GM is. So, they have $4000.00 in possible profit available but really more.
So to keep it simple, you walk in- they say they really need clean late model Trax for inventory. They offer you $14,000 on paper- that leaves $2000.00 profit left and they say they have offered you a great deal- you buy vehicle at list price- they make $2000.00
But wait- they have your trade on their books at $12,000- they used $2000.00 in profit on new vehicle to offer you $14,000.
They sell your used Trax for $14,900- all detailed etc. Now, they made $2900.00 on your trade plus the $2000.00 on the new vehicle so now they made $4900.00 off you but wait- if you finance- they mark up interest-called their buy rate-and then make more profit every month on the extra interest or they get a big lump up front from lender- more profit- but wait- the buyer of your used Trax trades their vehicle- more profit as shown above- then mark up their interest- more profit- sounds like they make quite alot of profit just form trading yours and selling you a new one. List price means nothing- oh, then they get a percentage from GM called dealer holdback- could be hundreds of dollars and other spiffs from GM and they may have made 6-7 thousand dollars by doing you a big favor by sending out a cheap post card now your payments are higher- insurance goes up on newer vehicle- what a bunch of swell guys they are helping you out- be careful when you buy- learn from KBB.com what your trade is really worth- let your own bank offer you their financing etc. Good Luck- I will not part with our Black LTZ either- we love it- it does have one issue- a strong smell of gas inside the car dealer is trying to diagnose- many others have same issue.