Combination - Starting/Ending with tires/wheels. Tires/wheels affect everything on your vehicle. Its the start and ending when you mod. To fit tires/wheels, you need suspension lift, body mods, deeper gear ratios, driveline mods. Due to the larger tires, the driver will try to negotiate tougher terrain, so this affects recovery, skid plates, protective plates for the body, roll cage. With all this add in regular maintenance as a cost. Going offroad drastically increases the schedule for the maintenance.