Just finished installing my twin battery set up with a T max split charger and two Numax batteries, used some nice truck bed spray paint that i found in halfords
i used some anti slip paint on the imside od my 90, i just roughed the surafce up and painted it on. i'll look it up when home as it was 1/2 the price of the kits
I upgraded mine to 85amps, was told not to go more with a tdi v belt,I used a mini alternator and with all my lights on the voltage drops just below 14 volts, got it from eBay for about £65