Headhunter Leviathal Reserve

I got a question about the RoW mentiont in the Title, how do you guys play with the Vehicle type Unit in Reserve? I got in my List 2 Predator-Support-Tanks with meltas and a Dreadnought with 2 Big Meltaguns, im not Sure if the Dreadnought is worth with the Meltas then he comes from table edge of my side.