The shallow slide models get 14" tires, and lower ride height - s step entry vs. 3 for deep slide models. I can appreciate the usefulness of raising the lower trailers like mine.
All you need is larger diameter tires that fit on the rims. I don't know the size of the originals, but you can use
this calculator to determine how much larger tires will affect the height radius difference). You do need to ensure you have enough clearance to prevent rubbing the tires on the TT, though. You may wish to use a tire sales web site such as Tirerack to determine tire available by size.