I agree with the post above, and I want to warn you.

If you haven't heard, Integy tends to make a weak product (to be nice...). I would look for other ways to strengthen/weigh down the buggy before purchasing Integy products. They are made of cheap and weak aluminum that bends like butter.[:'(]

Perhaps zip-tie'ing the battery pack to the front somehow will help distribute the weight, but it may be unsightly. Perhaps you could purchase a 5-cell flat pack for the rx and it would look pretty good.