Understand that at 100 Watts RF Output, that HF rig is going to be drawing 20 Amps, and a 25 Watt RF Output Vhf FM Radio, is going to be drawing 7-10 Amps
... from the Battery. That means that a 26 AmpHour Battery even with a 80/10/10 Standby/Receive/Transmit isn't going to last very long in a Grid Down Senerio without external Input. Solar will supply some input, but only during the Day, AND only in fair Skies. In the recent CO Senerio, not much is going to be pumped into Battery when it is raining at the rate in the recent Senerio. Also keep in mind that Battery Charging is usually no better than 80% efficient, so it takes 120% more power to input 100% of used Power. In the Senerio of the recent CO Operations, Hams provided much of the EmComm Disaster Comms where they were able, from cutoff communities. That means that they had EmComm Power to keep those Systems running 24/7 for the duration. My suggestion is:
1. For a BugOut Senerio, the Vehicle needs to be able to supply the Required Power for the duration of the BugOut, as well as provide the Transport to whatever location is planned for BugOut. A secondary Energy input from Solar/Wind/other source is always a very good idea. 3 is 2, 2 is 1, and 1 is none.
2. For a BugIn Senerio, with loss of Grid, you need enough reserve in you Batteries to at least make it 24 hours. The plan on backup Power Sources, like Solar/Wind/Genset for an extended Operation, of at least a week, and maybe more depending how isolated you are. Again use the rule, 3 is 2, 2 is 1, and 1 is none.
Just having a Battery, and some sort of Charging System, does NOT a reliable EmComm System. Extra BIG Battery installed in the vehicle, (not Starting Battery but charged off the Engine Alternator) for EmPower will go a long way toward your goal. The Backup Energy System needs to be such that it can be broken down, and moved in a very short time. (BugOut Time)
Backup Power for the BugIn Senerio needs to be able to operate in ANY Weather. Wind, Rain, Storm, Snow, whatever.... So s Solid Backup Genset with enough appropriate Fuel Storage to meet the 1 Week Operational Time. Also you need to look at your BugIn location, with eyes that see the 100 year Flood Plane, 100 year Fire, and make sure that that isn't going to impact your BugIn location. (Top of Hill, not near the Edge, and NOT in River Valley... Clear local Brush, and non-combustale Roofing & Wall covering)
These are Long term decisions, that you need to work on, over time, to get yourself Prep'ed for Disaster/SHTF....
Just Say'en.... YMMV....