3D Level and Vehicle Design

Hello we need some support during our Unity 3D Game development. The game is about a car/vehicle that should drive throu a terrain with hills, drops and obstacles. The game will be rendered in 3D but The object will not be able to steer left or right. I need someone who will do the following tasks for us: 1. model/create 7 Levels with about 60 to 90 secs time to move throu the Level. 2. 7 vehicles for those levels. 2 Monster Trucks, 3 military vehicles (2 Tank, 1 Truck) and 2 Fantasy vehicles 3. The vehicles and Levels Must be imported to Unity 3D and configed there. We already have a script to drive and steer the vehicle. Looping forward to read from you.