If you store the object's old position you could position trail sprites in between by lerping between the two. Something like this:
repeat 10 times
create trail at lerp(obj.x,oldx, loopindex/10), lerp(obj.y,oldy, loopindex/10)
And if you want the trails to be a fixed distance apart you could do something like this:
repeat distance(obj.x, obj.y, oldx, oldy)/10 times
spawn trail at obj
move trail loopindex*10 pixels at angle(obj.x, obj.y, oldx, oldy)