i need some help deciding which way to go for a bike rack, i am not considering the roof mount because of the price. i am deciding between trunk or hitch mount. on the owner's manual (page 266 on the 2010, page 275 on the 2011) it states that installation of a tow hitch or the use of a tow hitch carrier for a bicycle is not recommended and that our cars are not designed for the use of hitch. yet i see lots of Prius have them. 1. for those that installed the hitch like this one, how do you like these? any trouble installing / using them? 2. for those that use the trunk mounted ones, how do you like these?