Well can't comment on tires in that size. Will say that Carlisle has a reputation for tires that blow out.
IMO look at the DOT code to find out the country of origin and the date manufactured. Personally I do not buy Chinese tires, since they have a reputation for falling apart or blowouts. I also don't buy tires over 6 months old.
Note complete DOT code is normally only put on one side of each tire, per Murphy, the side underneath your RV. Note if yours is a dually, DOT code is likely between duals.
Example from a tire: DOT MA L9 ABCD 4202
DOT is Dept of Transportation,
MA is Mfg Plant Code (see
http://www.harriger.com/ then look for tires link),
L9 is a tire size code,
ABCD is optional manufacturer info,
The newer tires are using 4 digits, the first 2 = the week, and the last 2 = the year.
For example 4202 = 42nd week of 2002.
Any tire with only three numbers at the end of the DOT code were made prior to 2000, and should be replaced IMO.