We do provide one full size, Load Range "E" rated spare tire.
Please note, that all of our vehicles are equipped with E rated tires - usually 10 ply - the strongest tires available. These tires don't have a problem on gravel roads, the tire does not get peeled off like a regular tire would. So flat tires due to driving on gravel roads will not occur. Of course, if you drive into a nail or other sharp object - that can cause a flat tire even on our "E" rated tires.
Over the last 10 years, we average about 2000 (two thousand) rental days for each destroyed tire.