To be precise, my 36" rim is narrower than yours, it has only 19mm.
The TPU tube failed at the seam after one night:
What’s your rim? I don’t know such narrow 36er rim 
I bought it online at eB**, I guess for the price of a normal 29" tube. Nothing special.
Schwalbe also sells heavier Air Plus tubes — 19AP (320g) and 19+AP (420g) while regular 19 is 220g.
Please note that SV means Presta. I have a 36er with Schrader, hence AV19 / AV19AP / AV19+AP are the tubes for me to try.
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Do you notice more air loss with thinner tubes? The 29" I use appears to be equal to the original 36" tube.
Why don’t you use the Schwalbe AV (or FV) 19F? It goes up to 29x 3.0 and weighs about 215g (manufacturer’s specifications).
It was self-built 7 years ago.
There you find the picture of the puncture.
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Yes, AV is much better because you can get air at every gas station. I only feared that the large bore diameter weakens my rim, but actually it works till now and I have “AV” installed.
why do you get air at a gas station? I use a bike pump, which can do both normal bike valves and car valves. Here at gas stations you need to pay for air nowadays, which is totally absurd, so I’ve even pumped my car wheels with a bike pump several times.
I only go on rides of 8-15km and the air doesn’t slip away at such a short distance.
I do the same, I have a manual pump in my car. But when unicycling I usually don’t carry a pump. Only in case of a small puncture or problem I could get air at a gas station. Once with another 36" rider he increased pressure at a gas station before starting the tour.
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Schwalbe tube product numbers start with 2 letters — AV, SV or DV. “V” is here probably Ventil (valve). AV is for Schrader (Auto), DV is for Dunlop valve, and SV is for Presta. There is no FV type as far as I know, you probably mean AV19F / SV19F family of tubes.
I use Foss in the 36er, and pump it up all the time, as it gradually loses the air.
I have AV19 as a spare, but I never used it so far. I got it from Amazon. AV19F were not available, and I was not sure about AV19AP/AV19+AP back then.
I do not think AV19F’s 215g is an advantage. The idea is to stretch the tube over a larger wheel, and heavier 19+AP sounds better for the stretch. I do not have practical experience with this idea though.
You’re right, of course. FV = French Valve = Sclaverand Valve. It’s designated SV. I had it wrong in my head, since SV and FV are the same thing.
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AV= Auto Ventil = “car valve” would seem logical for me in german, but when zooming in it appears to be AV=American Valve. But anyhow we all mean valve for cars (Schrader).
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As written in my rim article, the Foss valve requires a 7.5mm bore and the Michelin Butyl 8mm, what should be measured beforehand. I guess it will fit, because others installed these tubes.
Could it be Autoventil for Schwalbe and American Valve for Michelin at the same time? 
What explains the variations in bore diameter requirements.
I had the Foss tube with Schraeder/ car valve for many years and was pretty happy with it. But as has been said, you have to top up the pressure about every 2 weeks as it looses air.
Since maybe half a year (maybe 1year?) I have the TPU with Schraeder valve from einradshop and it has been great. Light weight and hardly looses air.
It has been discussed at length, and I agree with mist of the unicyclists that Schraeder/Auto value is better. Although in the bike world, the general manufacturer trend is such: expensive/quality bikes are equiped with French presta valves and cheap Walmat/Aldi bikes have auto valve.
I would recommend the Schraeder TPU.
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I’ve also seen manufacturers refer to Schrader valves as SVs. This creates confusion because SV is also used for Sclaverand Valve.
A Schraeder valve would be too big for a race bike rim, so Michelin came up with the narrower Presta.
Indeed it was a hard decision and not the best one to use the Schrader valve in a narrow rim. On the other hand I increased the diameter ‘only’ by 1.5mm, but with mixed feelings to that.
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