Using a dozer for what you want to do would work but IMO would become frustrating quickly. An excavator can do just as well as a dozer (actually better) and you can pile brush up without getting dirt in it. Digging out stumps and jus tmoving things around in general is easier with a hoe than a dozer. If you can get both working then that's a great combo but one machine show I'd go with a hoe.