Great looking truck Jager! I had flash backs when i saw the interior. It is a mirror image of mine when i picked it up although yours is in much better shape than mine was.
When i had my 02 xterra we ran with BFG all terrains and had great mileage out of them with even wear across the complete tire. But that was almost ten years ago so i'm not sure it would be the same.
If you do that be sure to put some steel wool in there and run said tube to about a 1/4in from the bottom so the wool will trap the oil mist from the blow by but let the pressure out the top of the can. or just buy an after market catch can for it and go from there.
Mustangs fuel tank is all metal not plastic. with that being said i would look at ignition things that got heat soaked from sitting in traffic and at the gas station. It will happen like that when things are on the brink of going bad.
Unfortunately this is the problem with off brand planes, Parts are never around when you need them.
I'm sure you have but maybe contacting the Manufacturer and see what they can do for you.
Also as far as a trainer plane to learn on that plane is a no no.
the standard way is to start with a three channel high wing plane like a supercub and go from there either by modding it and adding ailerons to the wing or purchase another plane with them and learn with it.