I have 380 x 150 - 5 tires on my RV-8. On grass strips, gravel, even packed sandy surfaces like at my gliderport, the larger tires are great, a really noticeable improvement.
I would not say, however, that they rise to the level of back-country tires. I wouldn't land on sand dunes or gravel bars with them, or even a field full of squirrel holes.
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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