mooty

trailex enclosed is way more than $10k
you can pull it with just about anything short of a pious and i am not kidding. it's light you can actually push it empty. it's not very tall, there will be no cross wind issue

ATC is also very good so are featherlight enclosed. both can be towed with your GTS as long as it's flat. gong up LS you will struggle a bit. 20 is enough for your car. 24 is better.

speedoflight

no kidding. when i used to tow using SUV with featherlight 3110/gt3, going up LS, 10mph!

KOAN

I know of an excellent used enclosed trailex that will be for sale soon. Its in Pittsburgh (easy to get shipped) PM if interested, I can put you in touch with seller. I bought his previous enclosed trailex, and sold it 5 years later for about $1k less than I paid to a friend who is towing with a Toureg. I moved up to F250 and 24 ft enclosed. Slippery, as they say.