220 drive is nothing. over load that sone of a gun all you want, lol. The weight of the trailer is less of an issue if it has trailer brakes which will stop the trailer leaving the truck to stop itself and the TC.
Tongue weight is important for tires and suspension. Airbags or heavy springs can hold more weight so the weak link will be tires or wheels up to a point.
4,000 lb trailer is not really heavy.
a 3/4 or 1 ton truck is ample, and people haul 30,000 lb trailers with 3/4 ton diesels all the time.
Read through all the post over the years discussin this exact topic to death.
As far as land, yes, most likely surbaban areas ban camping even on your own lot.