We do 3-4 day trips in the UK at around 200 miles and clock up around 5000 miles a year in out 1970 LWB. A sensible daily limit is around 100 miles just from the noise and battering even on the road. On a smooth motorway 200 miles or more is ok (we wear ear defenders) but a seriously long trip would take a long time with lots of stops. My first advice would be to do something like the North 500 as a lot of people have done this in series and there's some good you tube vids. You will learn a lot and by staying in the UK you can get spares sent to you. Just loaded for 4 days in the UK (ie not carrying extra water or fuel) we weigh 2 1/4 tons and despite my best efforts a lot of that is high up. We would absolutly not want to be raised up with an even higher C of G. The other thing is that you are carrying a lot of extra gear, toilet, cooking, food, bedding, sink, 240v inverter, solar panels and controller, leisure batteries, night heater, tools, spares, clothes (and a Tirfor) and that's without the "toys" - boat, bikes etc. This lot does not take well to any type of offroading, no matter how well you lash it all. I know people do these long over land trips, but I think there is a dillema - travel light and buy what you need as you go (look at the orginal Land Rover London - Singapore trip, 4 guys in a LWB with very little gear) or carry everything in which case you soon end up with a Bedford Truck size vehile and pretty heavy running costs. The problem you have now in a lot of the world is that a heavy 4x4 is a very attractive thing and there are a lot of people ready and able to take it from you. The Germans especially seem to have chosen to build overland campers that look more like armoured cars, but its not my idea of a relaxing trip if you can't get out. Take a look at that monster and image pulling up in a poor villiage and expecting to meet the locals!