I have never had any experience with bias ply tires. Until doing some research I did not even realize it was something that was used on pups. We had a flat(tread separation) while towing this past weekend on a set of Carlisle Trial Radial 145R12 Load Range E that were from 2012. We have a 2002 Rockwood Freedom 2280, dry weight 1847 and GVWR is around 2500. I will be replacing all 3 tires. I have always been very happy with the radials but wonder if the bias ply will do any better. Pup is stored inside on jack stands when not in use. I have way more than enough truck to tow and would like to have a higher speed rating tire.