That way you'll have time to make necessary repairs. If you leave it until the last minute, it could cancel or postpone your travels. Inspect tires, brakes, jacks, lights, oil, radiator, belts, horn, shocks, steering, windshield wipers and washers, lubrication and other vital equipment. Tires are one of the most critical factors in safe RVing. Since most tire failures are caused by overload or underinflation, be sure your tires are inflated in accordance with proper inflation pressures for the load you're carrying.
Overloaded tires are more prone to blow out.
Keep tires of similar tread patterns and similar construction on the same axles. Along with safe tires, properly adjusted brakes are essential. Don't forget the parking brake, because a slipping brake can drop the RV off its jack while you're changing tires. If you're towing anything, give the hitch and safety chains a going-over. Check the luggage racks.