A hard folding truck bed cover changes how you live with your rig. It keeps tools dry in a downpour and locks down gear so you can park downtown without constantly looking back. Trucks aren't cheap to run between fuel and upkeep, but mid-summer accessory sales give you a real break on parts.
We time this purchase for mid-summer truck accessory sales when prices usually soften up. When you talk to the shop, negotiate the bottom-line price of the cover and the installation labor first, completely separate from how you plan to pay for it.
The 0% intro window is a strict deadline, not free money. If you still have a balance left when those 18 months are up, standard interest kicks in on what you owe.