It is completely your decision on what brand and load rating tire to get.
Since the Carlisle D-rating and C-rating tires appear to be the same price,
I was just thinking that it might be better to start out with a stronger tire
to begin with.
I am new to some of these trailer tire things too and only recently learned
more after Scamp delivered my Scamp16D-A trailer with load range D tires
In the following links, I read that trailer tires should be evaluated by both
their tread depth and also their age. Also in that link, it suggests that the
strength (load carrying ability?) of a trailer tire decreases by one third in
just 3 years. That is why I thought that it might be better to start out
with a stronger tire with a higher initial load carrying capability.
(Who knows .... I could be thinking incorrectly about this?
Safely Maintaining Trailer Tires
Load Range and Load Index
I do know that my sister and brother-in-law bought a used Scamp16
that had almost new tread but had been sitting for several years under
a tree. Because the tread seemed good, they set out on a long trip across
the country. On their way home, they had a trailer tire blow out while going
down the highway ..... so I do believe the trailer tire age thing.
If I understand correctly, over three years, the C-rated tire would go
from an initial load rating of about 1356 down to about 894. The D-rated
tire would go down from an initial 1565 pounds per tire to 1032 pounds
I guess that you might ask the folks at Scamp for their recommendation?
I am far from an expert on this, but thought that I would just offer some
food for thought.
Good luck and safe travels!