Sounds cliche, but squeaky wheel gets the grease. With a 100% at fault police report, I'd think you or your ins agent could lean on the at fault's insurance to compensate for a rental camper until a settlement is reached. Fortunately, haven't been in a bad traffic accident in alot of years, but last one, took a couple months for full settlement on a totaled vehicle and rental was compensated by the at fault parties insurance the whole time.
In the mean time, if your trips are that important to you and you are somewhat certain that your camper will be totaled, have a plan to replace it immediately upon settlement.