Hairy, the simplest solution is to plug your motor home shore power cable into your inverter. You will likely need a 15A male to 30 or 50A female “dogbone” adapter. Google RV dogbone.
Panto, the vectors of the two phases in your home are 180deg apart, whereas 3-phase power vectors are 120deg apart. Check out DPS Store on Amazon (Digital Phase Shifter) for more info.
If the intent is to confirm a low resistance connection, consider a DLRO (digital low resistance ohmmeter). We use a Megger brand model at work, but others can be found for much less.
EDIT: other more cost effective solutions if a moderate current can be passed through the termination: thermal...
Definitely not recommended due to the much lower internal resistance of your bank versus lead acid tech. If there’s a radio control hobby store nearby, they will likely have a LFP compatible charger (that hobby calls it LiFe) that will get you by.
Hope this helps…
As with most things, it depends. Are your panels wired in series or parallel? If parallel, it doesn’t really matter how you park. If series, are the curbside panels in series or are the front-most panels in series. Can’t tell from pics how many panels you have.