You shouldn't have any problems providing you use the right size wire. I have 2/0 gauge stranded copper wire running from the battery to the engine. The engine is a 225 Johnson on the back of my V20 and a single battery almost under my pilots seat. I've never had a problem with starting it as far as power to the starter is concerned. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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