A hard-shell rooftop tent turns your SUV into a basecamp on wheels. It is a heavy investment, usually running about $2500, but it saves you from fiddling with tent poles and pegs in the dark. Late winter is the best time to buy because outdoor retailers are clearing out last year's inventory before the spring rush.
You want to negotiate the price of the tent itself before talking about how to pay for it. Once you have your final out-the-door price, you can manage the cash flow using a card that offers 0% interest for 18 months on purchases and balance transfers from date of account opening.
Remember that this is a repayment plan, not free money. If you have any balance left after the 18 months, the bank will start charging interest on whatever remains, which can get expensive fast.