Get an insurance binder until you get it home/running. Shop around if you want full coverage. Hagarty and a few others can write FMV (former military vehicle) policies if you have limited use plans (think parades, events, etc) and they will do full coverage for FMVs. Another option is to insure as an RV if you are going to build it in that direction (again, Hagerty will do that as well). Remember, with insurance it MUST be insured exactly the same as what is displayed on the title/registration. Most companies can actually insure these trucks, but many independent agents balk at writing the policies. The thing with insurance is to shop around. But be absolutely sure that if it's insured as a commercial truck, the title reflects that it is a commercial truck, etc, etc. Exact details are the difference between "you're covered" and "sorry, you were not forthcoming with what the truck really was and thus you are on your own after squashing that family of six in their wimpy little EV."
Side note: I'll second making the truck recovery an adventure if you can. I flew across three states (including Texas) to fetch my M1079. It was confirmed running, though. I just had to do then PMCS and troubleshoot the brake lights and turn signals. I spent six hours going over everything and then 26 more on the road. And it was perfect weather thru beautiful countryside (and at night the lights from the Oklahoma meth labs are a sight to behold).
Your truck at Hooks or at Lytle? Lytle is a civilian yard and super easy to get into. Plenty of community guys in Texas. Might be worth tossing a small fee to someone to give the truck a once-over (if it's at Lytle, they don't make much effort to start things beyond pushing the starter button). I've seen "non runner" trucks from there that fired right up with a a pair of Walmart batteries and drove off the lot. I've seen some missing the engines. Hooks/Red River you will go thru channels, jump a few hoops, background check, and the hairy eyeballs of the MPs at the gate. Hooks/Red River is an operational base and very by-the-book. If you do have it transported and it's at Hooks, make sure the driver knows that he'll be entering a military base for the recovery.