In reply to Lynsety:
Yep, Tiree is as flat as you can get!
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Ferries never were a problem years ago, but you sometimes had to remove bikes and racks depending on height restrictions, H&S, and how fully booked the ferry was, etc. It also used to be cheaper to put the rack in the car and push the bikes on the ferry - LOL; not idea if that is still the case!
Edit: Oh I see you said trailer, sorry. You may have to remove the trailer and stow it separately for same reasons as above - staff will keep you right on the day. If ferry is quiet and they are not expecting a rough crossing, trailers just remained attached usually. Better to speak to them when booking as you will be charged on length, etc of the trailer.
Post edited at 12:09