I don't know if I'm qualified to educate anyone, but here goes.
I generally avoid teflon tape. I have a fear (possibly unfounded) of it getting into places it shouldn't be., pumps etc.
Instead of tape I use RectorSeal #5, with which I have had good results.
My property isn't exactly flat, and I was concerned about the tank getting jostled and falling off the forks.
That is why there is an additional cross piece on the bottom of the pallet. With the forks captured in between, I felt that it would be less likely that the tank could tip over while I was moving it. I also assembled the pallet with screws, rather than nails.
The filter is a combo water/particulate type with a cast iron base, rather than an aluminum base. Hopefully stronger. Necessary? I don't know.
If the filter clogs with water/dirt, the flow will slow down indicating that it's time to change the filter. I opted for a spin on filter rather than the see through type because I felt it was less susceptible to damage. If the tank was stationary, it wouldn't have been a concern.
I decided to replace the battery in my truck since it was 7yrs old and use the old one for my fuel system. It was working fine in the truck when I removed it.
I have a battery maintainer/ charger and a volt meter hooked up, (mostly because I already had them) so I know the condition of charge.
I helped a friend of mine with a similar rig.
His has a 100gal tank, and the pallet sits on a dolly, so it can be easily moved around his shop. The dolly stays behind when the tank goes in the truck. ( don't need that rolling around)

If I had a cement floor, I would also have wheels under my tank, but since they don't roll too good on gravel..........
The tank came from TSC, and the pump from Rural King.
As mentioned, an automatic nozzle would be an improvement.
BTW the yardstick hanging on the wall is my fuel gauge. 2 1/2 gal. per inch. Very hi tech!
I hope that helps.
Best, Bill