I've towed most of my working life and tried them all, Utes are ok but there is the afore mentioned security and lack of passenger room. Landcruisers are good too, Just not as bombproof as toyota would have you believe.
The best tow vehicle I have used and still use is the Nissan patrol.
I have owned the 3 litre variant, the 2.8 litre td jobbie, the 4.2 petrol and my current worker is the 4.8 petrol.
They all performed a stellar job, even the smaller engined units worked well above their weight and both ran up many hundreds of thousands of kays before i moved them on.
The 4.8 laughs at any load I care to pull with it. It likes a drink but that has been minimised with some custom pipework. an ecu and a dyno. Its big, comfy. power to burn and refuses to fail. (it will also tow a loaded car trailer faster than that too Russ )
The other advantage to using 4b's is the weight over the front axle. rwd utes etc are ok but still subject to rock steer even on a well set up balanced trailer package. You start hitting some undulating road and the weight transfer to and from the front of the tow vehicle is far more pronounced in the rwd. The heavier fronted 4wd virtually eliminate this phenomina.
The only other option that I can see is the even bigger ford/chev pickup truck style vehicles but cost becomes a real limiting factor there.