The last bike I used for 'touring' was a Sturmey 5 speed with 16, Front set 32. 48, 54 with a light light long arm chain takeup the carrier was a steel arm with aluminum lower arm, the idlers and guide cages from a disused Derailleur. 27x 1 1/4 rear wheel and a 26 x1 1/4 front. (nose down, arse up before some clever triathlon riders thought of it). If you work the maths out, its stupidly high Ratio but on long slopes or near flat, using toeclips it would roll very nicely, the previous setup was 48 54 to a three Speed carrinying a 13T on a Sun pursuit bike replica (just as bad/worse in ratios) and got stopped for speeding ok so it was downhill and I was still pedaling. So yes I have and I do but, technology and products have moved on. I don't have time to seek the unseekable.