Mine would meet all those requirements apart from the fact that it will only take up to 15.2hh.
If you're looking for something that will have the weight capacity for 2 16hhs then I would say go to a dealer because only the very newest type of 3.5tons will have the weight capacity to carry two horses of that size plus people and tack.
Even a new 3.5t probably wouldn't have enough payload for two 16hh horses I'm afraid. My box has a good payload (1.25t) and I can only take G and all equipment (and me and maybe one other person).
hi, have a look on the Travel Two website. Polly specialises in 2 horse boxes and has been very helpful to me. all the boxes come with full MOT, warranty, service etc.
Try 3 counties horse boxes, im in the middle of ordering one from them, a part conversion which is much cheaper, it is all ready to use, but the tack area at the back is left as a shell. Saving alot of money this way, and then we can do it ourselves or get it done when i can afford it.