Hi and welcome to the site. Love the boat porn. Trim tabs are almost a must in my opinion. I know a lot of guys just trim their engines and are happy but when running through chop the ability to force the bow down just a bit to knife through the waves instead of riding up and over them really smooths out the ride. As to brands it's almost evenly divided between Lenkos (electric) and Bennett (hydraulic) brands. There are other brands on the market also but those are the two most popular. Sorry I can't help with the coolant issue since I'm strictly an outboard guy.. But again, welcome to the site. Looking forward to seeing more posts from you in the future. 
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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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