I also have a Sundance 2900MK as does FloridaRandy, and plan to replace, after 2 1/2 years of travelling approximately 17,000 miles, the ST235/80/16 Mission tires.
I have been reading these posts with a great deal of interest but I remain concerned about going to an LT tire if it is a different size from that which is presently on the trailer.
I would feel more confident in making a switch if other owners of a Sundance 2900MK reported that the switch in size worked successfully for them. But none of those reporting a successful switch own a Sundance and I am leary of relying upon the experience of others who have a Big Horn or Big Country trailer.
If I was convinced that the Michelin tire would work, I would purchase it. But in the abscence of reports from Sundance owners, I will go with the Maxxis ST tire.
FloridaRandy.... I will follow your decision with interest as I think that you and I have the same interest and concerns about switching sizes in going to an LT tire.