Photoshop composite: replace a rooftop tent on vehicle photos (product accuracy is critical)

About the project We’re GRAND4x4, an Australian maker of ute canopies and accessories. We have photos of our vehicles fitted with an older rooftop tent. We need the old tent replaced with our new G4 Rooftop Tent so the result looks like a real, unedited photograph... (Budget: $10 - $30 AUD, Jobs: Adobe Photoshop, Graphic Design, Photo Editing, Photo Retouching, Photoshop)