My previous TT was made of aluminium ..... Although it is lighter it also has it's disadvantages.... often (VERY often) I had screws falling because the vibration made them fall out of their holes...and then I would find out that well they didn't held anymore...
Plus try doing any modifications is a bit more tricky...
2014 JayFlight 28BHBE (replacing a 2009 Kodiak 25QS)
2011 Sierra SLT CrewCab 4x4
1200/12,000 Equal-I-Zer Hitch