Value for your $$ is an interesting thought because I feel it is a lot about what resources you have and how much sweat equity you are willing to give to a project. Just to add more 'fodder to the trough', here is a couple of my haulers;
1st, is my "U-HAULer" that we converted with living qtrs up front and 17' of car hauling space in the rear. It will run 90mph all day long if I want to however when it comes to fuel, it will melt your credit card at those speeds. Driving a respectible 70mph gets about what Glenn's van does, and with plenty of diesel power and the safety of big truck brakes & durability. The real benefits for me is its versatility. I can haul from one to three cars depending on trailer options, and in sans-trailer mode I can easily park in crowded motel or mall parking lots, ...and 5 people can comfortably sit or walk around up front while traveling. Like someone mentioned above, it doubles as an extra garage stall, and is used in many civic & church mission oriented tasks. An 8,000 lb winch pulls the car in really quickly as I can be entirely loaded and tied down in way less than 10 minutes. It has an air-ride suspension and with the pressure set at 35psi, it rides as nicely as a Cadillac. And (unlike driving a truck/trailer) my wife enjoys driving this rig.
In two-car mode:
One car inside and two on the trailer while cruising at the posted 75mph speed limit(!!) on our way to South Dakota last summer with my family of 4 along with one of their friends (total of 5) and everyones riding/sleeping either on the couch, bed, or reclined. The 120v power invertor lets them watch TV or surf the 'net to make the time go faster.
2nd) is a two-car trailer that we built to be narrow (to easily traverse through construction zones & congested traffic situations) and with a spread-axle design for stability. While you need to be careful making sharp turns to avoid scrubbing off tire rubber unnecessarily, the axle spread helps balance the load and it eliminates all of the wind buffering that happens when a tractor trailer passes you.
Big D, I agree with you about a 30' trailer being over $6k. In the next week or so, I am about to order a new 30 foot enclosed 2011 United Super Hauler tag trailer, ...and reasonably equipped is more than double your quoted $$ figure!

Brum et al, I showed you all of this to explain that it does not take a "thick wallet" to own a safe tow rig but it does take some resourcing and
ingenuity. Someone willing to put some sweat equity into building their own hauler like the one above can do so for less than the price of a used
½-ton work truck. It is licensed as an RV so tags & insurance are cheap, and the ability to make it meet
all your needs is worth the effort, and makes it even a stronger
value for you.
,