The only speed limitation that I know of (Larry, check me on this) is the speed rating of the tires. In the US, tires intended for trailers have a prefix "ST" just before the size. For example, a common trailer tire size is ST-225/75-R15. The prefix ST stands for "Special Trailer", and as far as I know, all ST tires are rated at 65 mph maximum speed.
The TM factory would certainly certify that they installed ST tires - in fact, the size of the tires is listed on a sticker (label) posted on the side of the trailer. Also, they should be willing to certify that the speed rating of ST tires is 65 mph, but if not, this information is easily found on the Internet.
Of course, if you have non-US tires installed, the speed rating of the tires may be different.
Bill
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