Are you able to leave town now?
If so, head south immediately. Drain everything that you can, now. When you get to warmer temps, stop and thaw out everything.
You should be working with an adjuster from the at-fault driver's insurance company on your truck damage. Get in touch with that adjuster and tell him/her the situation. You need 1) immediate housing with adequate heat and water, and they need to pay for it 2) compensation for the damage to your RV due to the freezing. Document all the problems, damage, etc with time-stamped photos.
If the other driver's insurance company won't help you out, contact your own, ASAP.
Single empty-nester in Middle TN, sometimes with a friend or grandchild on board