Large project. How would u write the classes.

[deurebokkn]

I'm writing a program and I could use some inspiration with the classes.
The pattern is already in place (using mvp because they want to expand to both website and phone in about a year). With a data and a business layer.

Background information
But it's about making trailers for trucks.
So the program has four catogories of trailers.
One trailers contains about 200 specifications.

Problem
Now I'm using about 35 user controls, so I can re-use them.
They all work with comboboxes so u can just choose between it.
Quick example:
U have axles, Different back doors, Bumper, Measurements.
The combobox datasource, value is in the table with the data of the vehicle.
the display member is in each a different table with a relation between it.

Possible solution
Have a class for every table. Then have another class for every usercontrol where you implement it.
Then 1 class for the trailer.
But that is alot of classes?

Any other suggestions

Thanks in advance