See this thread on maximum trim:
http://www.offshoreonly.com/forums/f...8255-trim.html

Fountain likely has this setup so that to go higher/past this, you have to use the trailer button? (not sure on your boat)
Regardless, you need to know where the above referenced trim cylinder extended distance is on your indicator.

You also need to know what "neutral" is which is referenced above, yet not by name.
Neutral on tabs and drive is when the tabs are on same level plane as the aft running surface of the hull. Use a long straight edge running off the end of the hull, and measure the front of the tab, and the aft of the tab, and they should be equidistant from the straight edge.

Same goes for drive. Your cavitation plate needs to be parallel with the aft running surface of the boat. Most step bottom boats are fasted at neutral, or a few ticks above neutral.

Mark these on your trim indicators with little lines of tape or a Sharpie until you memorize them. Then it's easy to find them without studying the dash.

Take recommended trim settings given to you over the internet with a grain of salt.
Every boat's trim indicators could be placed in different positions.
Cable lengths vary, especially if replaced.
Older cables stretch over time.
Newer cables are a little tighter/shorter.

You need to know your exact measurements on your exact boat.

You can affix large tupperware containers on either side of your engine by going sideways into the stringers. Just make sure you seal the holes. And nothing comes close to any moving parts or the exhaust.

IF you are going to do this, make sure you have positive lock closing lids. (Lids that will stay closed even in rough water.) Also, I would have anything heavy like the anchor also affixed to the bottom of the tubberware perhaps with a base plate of starboard.

Look up the "Box Anchor". Some people love them. Some people hate them. Best part about them is they fold for easy storage under back seat.
Also, some people opt to shorten the end bars on Fortress anchors for better storage under back seat and other places.
You don't want to go in your engine compartment every time you need something like the anchor. I keep two large fenders outboard of my engines, and I find I rarely use them anymore unless staying for a while in a really "rough neighborhood". (choppy water)