That salesman would be thrilled to see you drive out with that 24' trailer. But, you're not equipped to handle it for several reasons. FWD is not great for a tow vehicle. Is the 4100# the total weight as it sits on the lot - the weight posted after manufacture and put on by the factory? Probably not. Most likely it's the dry weight and that doesn't include much of anything but a naked trailer. And don't forget the drag from the barn door effect of a full size trailer. Somewhere in your manual, there may be info on towing. A boat and a TT weighing the same amount are two totally different creatures to tow. True on the 1000# wiggle room being a good number.
Please take the advice of those who've tried this....before you get out of Chi, you'll be shopping for a beefier tow vehicle. If you feel strongly that you'd like an RV of some sort to get started, suggest you look at a Pop Up or one of the great little chalet-type trailers that fold down and reduce the amount of drag.