First thing that stands out in the pics is the lowers, as was said already, something doesn't look right there, I'd ask seller for more detailed photos. The floorboards should have no effect on the location of the lowers.
Low speed handling problems usually are due to loose neck bearings or shocks set to soft.
The bolts that secure the drive shaft to the rear end sometimes loosen and go missing, causing a drive line vibration.
Depending on build date of the trike, there may be some issues with rear brake rotors and pads being mis-matched causing accelerated brake wear. Go to the trike forum here and do a little reading. Lot's of good info in there.
Consider,,, there is no aux fuel tank, you'll want to add them. Carbon One makes a nice aux tank Another nice thing to add is a set of Flanders G2 handle bars with either longer braided steel or stock RSTD cables. Up to $700 depending on what cable set you use.