Trailer in Auckland

I'm going through process of getting a flat bed trailer priced up . Our Polly deliveries are done by a business from Auckland . They have put me onto a trailer builder in Jaffa land . If it's going to work out as cheep as there purpose built trailers , it's going to make it a feasible option .
Now my point is : option 1 is there any one who travels north to South that has to cart your wares on a trailer . I'm thinking bring mine I pay a nominated amount to ch ch . And you don't have tow it back .
Option 2 . If someone was relocating to south island and could load it up and bring it down .
Could this work ?