4Runner was only available in 1st and 2nd gen forms, and they never sold that many. The 3rd gen on was never sold here. All ours come from Japan as they are also right hand drive.
:wtf: Do you have any examples? Are you comparing all of Europe as one country with one set of laws?
Only law I can think of that is would be regularly exceeded from looking at trucks on overseas forums is that wheels/tyres are not meant to "poke" out the side, although thin rubber arch extensions will make that legal, if anyone from the law complains (I know plenty that have vehicles that blatantly flout this law and have no issues at all)
We do have a yearly roadworthiness test (MOT) that checks many things and you can't drive it if you don't pass it (lights, brakes, seatbelts, structural rust, wipers, ball joints bushes, leaking exhausts etc) so obviously of you do something retarded like remove your exhaust and headlights, you won't be able to drive.. but I'd say that's pretty much common sense, and keeps unsafely maintained vehicles off that roads.
Australia have some pretty tight laws, from memory, no lift over 2" was one!
I have an example in a different area: I just visited some friends in France at Six Fours De Plage and they have a Nissan Patrol on BFG 31" tires. You would not believe the number of governmental regulatory agencies that they had to navigate to get those "huge American monster truck tires" imported and installed on their patrol. They are actually not supposed to drive it on the road in Europe because it is 4" higher than stock. I believe in the EU there is a law that states: "no part of any car may be modified in any way from its factory equipped components" The number of modified 4x4 trucks I saw in Europe on the road was exactly 0.