extended warranty

I'm picking mine up next week and need to decide on the extended warranty. My previous 5er I had a 7 year and it almost paid for itself with one leaky gray tank replacement. On this new 5er they want $1400.00 for 5 years which I guess means really only 4 years cause you get one year from the manufacture. It's not so much the appliances I wander about its more the water lines, tanks and things buried under the 5er.