dual battery controllers 24 volt

[CreviceSucker]

Hi

can anyone give opinions about 24 volt dual battery setups ?

Its in a truck based camper and we want to install dual batteries where the secondary batteries will run a 2500 watt 240 volt inverter and the main batteries are kept for starting only.

which of these is the better product or are they same same except for price ? ( $ 95 - 450 )

http://www.ebay.com.au/itm/DUAL-BAT...-CONTROLLED-/111463624332?hash=item19f3bfee8c

http://www.ebay.com.au/itm/Blue-Sea...ine-4x4-4WD-/271750941506?hash=item3f459e4b42

http://www.ebay.com.au/itm/CTEK-D25...ery-Charger-/250908468747?hash=item3a6b4f660b
( this also needs the contactor on top of that price )

any opinions ?