Just picked up a supercharged 91 sambar van with 55k on it that I'm planning to build out into a fun micro camper van. The intended use is lots of highway miles with two people and lots of camping gear. I've done a few camper van builds but never owned a Kei car, so lots of things are new for me. I have a few questions to start out with for anyone kind enough to reply: Transmission: it's a 5 speed, is there a possibility of getting a 6 speed? or some other way to get one last high gear in there to bring the RPM's down a bit on the highway? Is it really ok to run the tach at 6000 for long periods of time? Tires: go a little bit bigger (like 7% bigger). or not? Those tiny wheels just seem wrong, and a little more clearance might be nice, I've read reports of better handling with a little bigger tires, true or not true? How much power loss is there really with just a moderate increase? I'm fine to stick with the stock size if that's what makes sense. Anything I should be thinking about as I go through the vehicle, weak spots in the engine or other components that I should check or replace before they fail? I'd rather put money and time in now than break down later. Any other advice for a new guy who knows nothing about Kei vans? Thanks for any replies. This is such a cool little van. I'm hooked.