It's hard to drive your own RHD car in a LHD country because you've built up a habit for driving and do it nearly instinctively,but you break into it fairly quickly. The worst part is overtaking,parking and merging with traffic. TBH i'd be slow to drive a LHD car here every day,it would get really tiring in a daily driver.
Not really understanding the intense boners you guys in the States are rocking for diesel trucks,i've never driven a 90's diesel 4x4 that doesn't feel underpowered,they might be a bit more economical,but when they're screaming just doing the speed limit it is soul destroying. I guess if you do spring for a cruiser or LR the UK wouldn't really be the best place to pick one up,most of them are rotting,probably a better bet to go somewhere like spain or Italy,where the roads are less likely to be salted,and you'll also get a LHD. I know a guy got a fairly old santana in spain and it is like a brand new truck underneath,it's like a time capsule