driving from Austin to Alaska and beyond

Tella,
Welcome to Travelblog! Your trip sounds like an incredible adventure! To provide the best information, we need to know more about your plans, specifically what you'd like to do along the way and the amount of time available. Several bloggers on this site have driven the Alaska Highway, and their posts will have ideas.
Assuming your main interest is outdoor adventure, I'd recommend a route hitting lots of National Parks and similiar areas. Big Bend and Guadalupe Mountains in west Texas are a long drive from Austin but are incredibly beautiful. Both of these are close to Carlsbad Caverns, and then the mountains of New Mexico. From there, head for either the mountains of Colorado or the incredible desert scenery of southern Utah. After that, head for western Wyoming, Grand Teton, Yellowstone, western Montana, and Glacier National Park. Finally, Jasper and Banff in Canada lead to the Alaska Highway. Campsites are readily available in all parks but should be reserved as far in advance as possible. If they are booked, the surrounding National Forests also have sites.
The trip will be amazing. Please blog it; we'd love to read it. Reply to this

The best advise I can give you would be to read my blog Trip 7 - August 7 to September 17, 2011, in which I took exactly the trip you described from the Austin Area on Hwy 290 west via Fredericksburg and Junction to I-10 West and then to Van Horn where I cut up through Guadalupe Mountains National Park and into New Mexico visiting Carlsbad Caverns and Roswell, then heading west and through the White Sands National Monument towards Las Cruces where you can head North on I-25 visiting sites of interest in New Mexico and on into Colorado.
I have traveled pretty much the route you are suggesting up to Montana just above Yellowstone and have blogged about it giving specific routes and campsites , most of them free.
One thing I very much suggest doing is at the first National Park you come to buy a National Parks Pass. For $80 it will allow you and everyone in your vehicle free entry into National Parks for a year from the date of purchase. It will very quickly pay for itself in savings.
If your camper doesn't have a microwave get a small one and put it in it for when you have electricity. You can cook and heat food in it as well as boil water for coffee or tea.
Once again , I am not self advertising here but will say that reading my blog on pretty much the route you have indicated you wish to go would prove useful.
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