The SR4 should go in most. My door is 2.1m and my old boat (SR4) went through with miles of clearance. My current boat (2m beam) I believe is on a par with an SR4.7 and goes in with a careful aim.
AboarD Boats & Yachts Market - SR4.0M Searider Reckons the SR4 is 5'10"
AboarD Boats & Yachts Market - SR4.7M Searider Reckons the 4.7 is 6'6"
If you are worried about width, the Humber O-Pro range has a 2m beam subset with lengths up to 5.3m. The other thing with SR4.7s is that they are like hen's teeth to find. If you have a 23' garage you will be infinitely easier finding an SR5.4.
Also be careful when you buy that there are few braked trailers sub 2m width. (not a problem with an SR4 - it is so light it doesn't need brakes) but there are only about 3 braked trailers will go through a "standard" garage door.....