I tow with a VW Touareg V8. It has 310 HP, it is way more than adquate for my 17 ft. Bigfoot
. Going up to the tunnels on I-70 in Colorado I could and did maintain speed limit. Now VW has reintroduced the V-10 diesel in model yr. 06 & 07. They are very fast, get fuel mpg in the 20's and currently being offered for sale
at anywhere between 10,000 to 15,000 grand off. There is a very impressive diesel V-6 which will probably come in the '08 facelift model. Some Colorado members drove it two Summers ago on a high country Jeep trip around Western Colo. They all raved about it and still do. MPG in the high 20's very good power band once the turbo spooled up. All these models have a 7,700 towing limit, VW doesn't recommend a load leveling system when the cars have a air ride self leveling system. There is nothing to compare to the ride quality of these beasts.
If you are in the market for a V-10 diesel, 15 G's off is teriffic.