Maintenance of the battery(s) is the most important. Any quality battery will last for years if taken care of.
AGM (absorbed glass mat), wet cell and gel cell batteries are all good choices. But opinions will vary.
Need to know the uses of batteries (lights, heater, etc)? How long are your trips? There is no need to buy a battery for $300 if it does not fit your needs.
If you do not have a power source to take with you, then you need capacity. That means you need batteries that hold a charge for long periods. And you will probably need to hook batteries in parallel to achieve enough capacity to last the whole trip.