I have Dynamatted all four doors. I like the results. Before I do the trunk, I wanted to find out exactly what you gained by doing the trunk and doors vs. just the doors.
My Sublink sub sounds great without Dynamatt and I have no rattles in the trunk that I know of so far.
Does Dynamatting the trunk just make the sub sound a little better or does it also make for a quieter ride?
Doing the doors has made a small difference in lessening road noise. If doing the trunk will help with road noise, I'm more likely to want to do it.