Yep - without any problem at all .The small Avons are very very light - I'd guess the Focus is rated to 750kg unbraked ( ?) and the 450 will be well within that.
A quick look at the car manual will tell you the max weight it should towand a few asums for the boat & engine & bits should see you around 550kg I'd guess ?. ( engine is what 115kg - same as the 50 I have? , Boat maybe 220kg tops ? ( the 410 is 199kg), bits & peices another 100kg ? + trailer etc and is still around 600kg ish worst case ? )
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