Dual battery set up

th3 shifty said:

Going to have extra electronics in the truck, flip down monitor, possibly run an Xbox. I also do have a car hauler with lighting and winch..

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In that case you might want to install a battery isolator and switch, that way you can you use the 2nd battery alone (like for the winch) when needed and not drain the main battery.
lots of marine applications use isolators so there are plenty of choices out there, tons of them on amazon

th3 shifty said:

Going to have extra electronics in the truck, flip down monitor, possibly run an Xbox. I also do have a car hauler with lighting and winch..

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You would probably be fine with just upgrading your alternator or upgrading to a lithium battery that puts out more juice.
Xs power makes some really nice lithium batteries

Take a look at the Battery wiring on a 1982 GMC diesel. Simple and effictive. Or you can look at boat/marine wiring. Everyone lately tries to make things like RV wiring... Automatic, too complex and no way to isolate or easily test, with high failure rates.

justchecking said:

What will be the purpose of your dual battery setup? Mine is set up so I can power my camper from my MAIN battery (in the original location) with my secondary battery solely as a backup in case the main battery gets run down or fails. That just happened. My MAIN battery (Diehard Platinum with four year replacement warranty) died dead after 2.5 years. I just flipped the switch to the backup and away we went. The backup is only connected/charged while the engine is running when the switch is in the normal position. The start position switches it in parallel for starting. The system I use is the HellRoaring backup battery system. Easy install.

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What size height of the battery?

Same as the oem battery. Two identical batteries

th3 shifty said:

Going to have extra electronics in the truck, flip down monitor, possibly run an Xbox. I also do have a car hauler with lighting and winch..

Click to expand...

A couple anecdotes. My '04 Yukon XL is loaded to the gills- Bose system, Entertainment/monitor, electric everything and Sunroof. It has one Group Size 78 battery, which seems sufficient even cranking the 8.1. Spec'd for 145A generator. In any case, your 'down the highway' usage has to fall within about 80% of generator capacity.

My '94 6.5 turbodiesel pickup is spec'd for x2 Group Size 78 batteries due to the huge starter and 21:1 compression ratio. The boxes on the '94 hold a size larger battery, and I have a 12k winch installed so I upgraded all the battery cables with military style terminals and the larger batteries.

Since I have no need for engine-off battery capability, there is no isolator. It's not a bad idea to have one between the tow vehicle and trailer, if the trailer has a larger battery than the small breakaway service battery. If you're going to do sound system competitions or spend long hours in the park with the radio on and engine off, auxilliary batteries and isolator are a must.