I have both of my boats on tandem trailers... BUT.... both of them were on single axle trailers before I transferred them, and both of them pulled nice and straight with no problems. As long as the trailer is rated for the length and weight you are putting on it it should be fine. My V20 used to make the trip to Fla and back once a year (1600 miles) each way on the single axle with zero problems. The primary advantage of a tandem is the extra tires if you get a flat. Most times you can still (carefully) get home.
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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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