It would improve a number of the game's aspects - for example, it would generate conflict, as you could intercept enemy shipments of vessels. It would emphasize the important of tridents, because of their 600cus of cargo.
It would make the universe more interesting. Imagine turncoats selling ships to the enemy, ship smugglers buying Proms from Serco pirates and flying them to Itani space while dodging Serco patrols, merchants who'd sell ships to anybody, etc. Plus, when we have more manufactured ships, there'd be a market springing up around that.
But to make moving ships a bit more accessible, make ships around 50cus - maybe you could get a device that decreases their size.

Vultures are already 100cu as cargo.

+1 to op but only in tridents gives another reason to own one

No. There is no reason a ship I currently move in a Moth should suddenly only be able to transported in a Trident.

+1
This happened before due to a bug. Make it so people can only equip the appropriate engine for the ship and it's not a problem.

http://www.vendetta-online.com/x/msgboard/3/26999
Ferrydent: Ships ferry using Tridents

+1 Already proposed and feasible as of now, using workarounds... but should be an ingame activity.

-1 to small ships carrying small ships.

What do you mean about small ships carrying small ships? If it has 50cu or more it should be able to carry a ship.
And why are you +1ing your own thread?

He's +1ing your idea Snk, do you ever read things more than once, or do you just read the parts you want to?

Anyway, +1 to OP.

I don't understand why snk vehemently hates Alloh, lol. Are you brothers or something?

No, he's just annoying.

And you aren't?

+1 ....i like the idea...

this is a good addition when the devs FINALLY fix the infinite ship problem.

+1 btw

Snake is just pissed off because his original idea was not so original...