Apologies for the delay guys; here I am asking for assistance and haven't been engaged in the conversation.
Jimnlin, wow you are right, I didn't provide much for details. The tires on the unit now are 225/75/15, gross weight of the trailer is 15,500. I don't know the actual weight rating of the axles but there are 3 and one can assume they are at least 5,000.
I was out measuring this weekend and here is my dilemma; I believe the existing tires are 28.2" in diameter; finding specs on a Carlisle isn't easy. The Duravis R250 225/75/16 with a weight rating of 2,680 are 29.4". This means an additional 2" required between tires. There is currently 4". How much space is required for expansion and articulation of the suspension; would 2" be enough?