Although I rarely take my PT-1418 anywhere away from home, when I do I tow it on a 5x12 single axle trailer rated for 2900 lbs (legally rate for 2900 lbs...it actually has a 3500 lb rated axle and 1800 lb rated tires). The PT's aren't much heavier than a big lawn tractor (unless you have ALL the attachments!), so unless you haul it frequently and long distances, I wouldn't be too concerned about hauling it on a smaller trailer.
I'd suggest that you check with your home-owners insurance to see what kind of coverage you have for the tractor. I know for mine, I'm covered in terms of liability and replacement cost of the tractor regardless of where I am as long as 1) I'm operating the machine and 2) it's not being done as commercial business. So, if I tow it 200 miles and help my father-in-law move dirt, it's still covered. However, homeowners insurance can vary considerably, so check with your agent and see what coverage you have. Toys (like 4-wheelers, etc) usually aren't covered, but "tools" used for maintenance of your property (like tractors) usually are, in some shape or form.
HTH,
Dave