Bolting a tent to your roof changes weekend trips completely, but it changes how your vehicle runs too. You will lose two or three miles per gallon on the highway, feel extra body roll on windy passes, and need a beefy crossbar system to support the weight. Retailers know people stop camping once nights get cold, which is why late summer clearance events are when inventory prices drop fastest.
Negotiate the gear itself before you touch financing. Ask for bundled mounting hardware or discounts on floor models that stores need off display. Once you lock in a solid price around $1,400, you can split that cost over time without paying a penny in finance fees.
Keep in mind that 0% interest is a grace period, not free money. If you carry a balance past month 18, the card's standard ongoing variable rate kicks in on whatever balance is left over. Treat that 18-month mark as a hard deadline and clear the tab on schedule.