Friends who've backpacked with younger kids report it's simpler to manage with babies (who are easy to carry) than with toddlers (who are not). Remember that diapers add bulk to the load: one dad we know wears a front pack filled with a multiday supply, plus lots of plastic bags for packing out soiled ones.
To avoid carrying your packs for long distances, choose a site that's an hour or less from your car. You can use that spot as a base and take longer hikes, wearing lightweight day packs, during your stay.
Note that you'll need specialized equipment for backpacking (potentially boosting the cost of a camping trip), plus you'll have to put in time before your trip developing an efficient packing strategy. If you plan to backpack in a wilderness area, contact the ranger before you go. There may be restrictions on where you can camp, and you may need to buy a special permit.
Please keep in mind that phone numbers, addresses, and prices are subject to change.

