Yes, they are a fairly common to fail in the OTR trucks, not so much in the RV sector, just because of the low miles! You have to realize the many heat/cool cycles these clamps go thru, to understand the fail rate! Glad your roadside fix, held up, Good Job!
And now that you have a spare, you will never have this problem again! How it works for me, anyway!
Retired, and "Always on Holiday!"
1996 Monaco Windsor 38PB, "Mona" 275 HP., 8.3 Cummins, 3060 Allison 6 speed, 2001 PT Cruiser, "Bailey"