I was looking to get a roof rack type carrier when i bought the GTI as i had the Thule bike mounts and aero bars already from my previous car but there are no mounting points so the rack had to be clamped to the roof which i didn't like. It looked far to likely to damage the finish and kept the outer seal open all the time. I'm sure Thule have it covered but it made me wince looking at the fittings.
Tow bars are expensive to fit on a Mk 5 as well apparently
Yep totally agree the cost of a tow hitch and the ball mounted racks are much more expensive, hence why i don't have one. Still want one though maybe the price is why i do.
I would prefer to have one on the rear so I can keep an eye on them, but I've done a lot of research into this over the past couple of weeks and even Thule don't recommend their rear-mounted carriers on cars with spoilers (again, they advertise them on the back of a car with a spoiler, as do Halfords!).
I'm sure they don't recommend it for legal reasons. But as long as your careful and use a bit of common sense the Thule and Saris ones i tried were fine on the GTI. I even had two downhill bikes on the Saris with no ill effect. However, don't take my word for it. I would hate for you to damage your car because of my comments and past experience. Wow, I feel much better now I added a caveat.
I also found it a bit ridiculous to have a Mk3 or 4 with a spoiler on the box then they say the mount was not suitable for that type of car, did my nut in.
as two bikes plus luggage inside the car probably won't fit!
and when you factor in mud it can really make a mess keeping the bikes inside.
I don't think there is an ideal solution, rather you have to kind of find one that you can put up with.