Strap a heavy-duty roof basket to your car and you instantly notice the drag on your gas mileage and the hum at highway speeds. It is a rugged addition that solves trunk overflow, but you still have to pay for the gas hit and the gear itself. The sweet spot for buying is late summer when outdoor travel gear starts going on clearance to clear warehouse space.
We can separate the price negotiation from how we pay for it. Always haggle or hunt for the lowest sticker price on the basket and hardware first, treating the financing tool strictly as a backup for the total. Never use a payment window to justify buying a pricier model you wouldn't otherwise afford.
Keep in mind that 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money. If you still carry a balance when those 15 months end, deferred interest or standard rates will kick in on what is left over.