Gas prices are up, but many still plan to take that summer vacation -- perhaps a bit closer to home.

Before you leave, it's good to have the car/truck running properly. Breaking down, even with towing insurance, can foster divorce. Not good.

CarMax Inc. sent out a list of tips to prevent disaster.

"Most summer vacation trips are driven under what can be considered severe driving conditions," said Juan Crespo, CarMax ASE certified master technician, in a statement. "It is usually hot outside, travelers run the air conditioner, and there is always a lot of stop and go traffic -- these conditions can mean additional stress to your car's components and systems."

Read on for the list of tips, including everthing from tires to transmission.

Tires

-- Check tread depth, and look for bulges and cuts both in the tread area and in the sidewalls.

-- Check air pressure. Set the tire air pressure to your vehicle manufacturer's specification when the tires are cold.

-- Do not forget to check your spare tire, jack and tools. You need a good spare tire with the proper air pressure.

Transmission

-- Check your odometer and look in your owner's manual to see if the transmission is due for service.

-- The transmission fluid should be clean, and not smell burnt.

Suspension

-- Have a professional check the condition of ball joints, tie rod ends and other steering and suspension components.

Oil and filters

-- Change the oil and oil filter as often as required by your vehicle's manufacturer

-- If you are towing a boat or a trailer, look in your owner's manual for information on the manufacturer-recommended type of oil to be used when driving the vehicle under severe conditions.

Air conditioning system

-- On older cars, even if the system works, have a professional perform a thorough check, including the fan(s), the compressor clutch and the belt (while they're at it, have them check all the belts under the hood). A malfunctioning air conditioning system can cause the engine to overheat.

Cooling system

-- Have a professional check to ensure it is working properly and is filled to capacity with the right coolant. Heat can severely damage or even ruin your engine, and can also affect the vehicle's air conditioner.

-- Emergency supply package

-- Make a care package for your car, include the following: anti-freeze, oil, screwdrivers, flares, pliers, jumper cables, flashlight, and a first-aid kit.