While a five-door Jimny is rumoured to be in development, we'd be surprised to see it sold in the UK. The future of the Jimny is under threat as its high CO2 emissions hinders the brand's ability to hit new CO2 targets being introduced across Europe in 2021. To answer your question, yes, a longer wheelbase would probably make the Jimny a slightly better cruiser - but not as much as a more refined engine and six-speed gearbox would. It could be worth looking at the Suzuki Vitara - it might not be as capable as the Jimny off road, but it sounds like it'd suit your requirements better.