Now I'm agonna have to read up on perturbation theory.
But one would think any large impactor would have some effect on a planets orbit. Uranus got rolled by something. Maybe not an impactor. Prolly happened when "Venus" came cruising by on it's way to become Venus.
The tipping of Uranus (ew) has been explained different ways, but with a “normal” system of moons, the planet must have tipped kinda sudden like due to huge impact; or there was some kind of encounter that caused the tipping, and the moon system was acquired at a later time (retrograde orbit is often considered diagnostic of capture, so having Uranus tipped counts, with the resulting moons’ orbits lying basically in the ecliptic and prograde by concensus with the rest of the planets’ moon systems); or there was some kind of later acquisition of the deep liquid atmosphere which came in cockeyed, flipped the planet’s axis, and the Uranian moon system used to be much bigger, some of the moons wound up lost, pulled in, etc; or the impact (a very big one) came in from what we’d call the polar direction, i.e., perpendicular or so with the solar ecliptic.