rental cars

[oddjob]

why is there such a big difference in rental car prices, between the cheapy places and the big names? they're the same type of cars, but the big names are double the cheapy places.

am i a retard, and companies like trifty and dollar are untrustworthy or soemthing?

also, i have a friend that works for enterprise, that swears you should get the insurance, even if your auto insurance covers, cause if you do total the car, your insurance will not fully cover it or somethign stupid. does this just sound retarded as well? anyone have experience in this?

please to explain to me!