First trip and need new tires

Before we can be of much assistance we need to know what the GVWR is for your trailer or 5th wheel and what size the tires are on it now and what size and brand was on them originally as shown on the sticker on the side of the trailer. Carlisle does not have the best reputation for ST tires although they have a new one out that has only available for about a year and a half of history so far which isn't enough to draw any conclusions about it. Most of us whith 10,000 to 14,000 GVWR 5th wheels have not had good luck with ST tires of any brand and have now installed LT tires. Achieving much longer annual life and way more miles before replacement. There is thread after thread here on RV.net concerning tire failures and recommendations. A search will give you a significant amount of reading material. If you have 16" tires I would look at brands such as these LT Michelin Ribs, LT Bridgestone Duravis R250 or LT Firestone Transforce HT in the 3,000 lb rated tire arena. I just put on the Bridgestones to replace two sets of ST tires that didn't last 10,000 miles or 3 years each set on a 13,950 lb GVWR 5th wheel and am happy so far but only have about 2,000 miles on them and are only about two months old.