My youngest brother is the family member with the bad back... he's 2m tall and of skinny build. His back was very fragile and he always needed to be careful when driving longer trips. Before anyone says you can't drive long trips in Denmark, he was very active in his medieval reenactment hobby (doing his own clothes and armour, creating replica 15th century plate and chainmail armour (as well as the cloth and protective leather insulation that goes with it). That meant driving all over Europe from Scandinavia to below the Alps. But before that, he was an avid motorcycle driver and spent a long time before he found a motorcycle that he could sit comfortably on, for long rides (without hurting his back). I no longer remember the exact model, but iirc, some1100cc 80's Kawasaki model. Very uncommon in northern Europe.
As luck (or rather not) would have it, this particular years model came with a systemic weakness in the engine block and true enough, one day he was riding, one piston suddenly exploded out the side of the engine block. Engine was history and spare engines didn't grow on trees. After a few weeks of searching, he found a classified ad from a seller in southern Germany, offering an spare engine from a wreck. Slightly newer model engine, but my brother figured, with a bit of work he could make it fit on the frame. Since I had a car and a family member had a trailer, my brother talked me into driving to southern Germany. That was in the 90's, before google map was a thing. The only aid we had was an old version of Microsoft Maps (no kidding), from which we could print out the route we had to drive as far as Frankfurt. After that, we would have to wing it ๐
We started Friday at noon, drove all day and all night (taking turns at the steering wheel, the one not driving sleeping on the backseat). Stopped a few times for the "street food" (schnitzel ๐) at the stops along the autobahn and motorways. Saturday night at 2am, we somehow had made it to our destination in Idar Oberstein, got the engine on board the trailer and tied down. When we got closer to the Danish border, we stopped and loaded up the trailer with cheap German beer (there were still borders at the time). If we got pulled over and asked if anything to declare, my brother would show then the beer and declare that, hoping the customs agents would overlook the engine (import tax for that engine would have run up into a thousand dollars or more). Anyway, late Sunday night, two brothers arrived in back in their home town, with a replacement engine and a trailer full of beer ๐บ
...and two completely exhausted brothers. My brother managed to fit the engine on the old frame and got a few more good years out of the only bike he could ever sit comfortably on with his vulnerable back