Do it John. I regularly drain and run any gas left in my tanks in my Dodge Durango 5.7 Hemi at the end of the season, then fill my tanks with treated gas, I usually treat with Seafoam and have never had any problems. Sorry for your back problems. DO you have trim tabs on your boat? If not you might want to consider them... they really do smooth out the ride 
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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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