Formule to calculate speed/HP vs weight

[Flak]

What is the formule to calculate the following:

 

I have (numbers as example),

Engine HP: 1000

Vehicle weight: 1500 kg

Drag: 2 wheels 1 meter diameter, rubber and a metal track link 3 meters in lenght on ground contact.

 

And I want to know the speed that the 1000 HP engine develop to the 1500 kg weight vehicle with and without drag plus to calculate for example the vehicle speed when towing a 1000kg trailer.

[Flak]

Nevermind.