Gotta love the "get a different vehicle" angle in some of the answers.
As the owner of a '92 200TDI Defender as well as a 1.2T wind-up camper (which is almost as tall as a modern pop-top and possibly heavier) I have no complaints. If you expect effortless hill climbing, think again. If you expect to hold 100km/hr in all circumstances think again. The chassis dynamics, steering etc are more than capable. The braking is fine (I have override brakes on the camper). Engine braking is good but then i'm only comparing to petrol. Where the 200TDI lacks is in power - 90km/hr is a reasonable goal, a little more down hills and a little less up them. And Noise, Vibration and Harshness - well, you know that already by now. It doesn't get better under load!
But I wouldn't consider trading. After Christmas we'll take the camper on a 4000km trip over 4 weeks. I am happy to accept the limits of my vehicle, so as I say no complaints. I wouldn't look at a large van, though, and as said minimising height and width will maximise highway performance, not to mention trail performance.
Steve
2003 Discovery 2a
In better care:
1992 Defender
1963 Series IIa Ambulance
1977 Series III Ex-Army
1988 County V8
1981 V8 Series 3 "Stage 1"
REMLR No. 215
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