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I went with a Tundra 1800W inverter in my service van. That's for power tools and my small laser printer (even the little ones pull ~5A and need something a little smoother than a square wave output.)
It was suggested I go with a pair of dedicated 6V golf cart batteries to have some good runtime. I went with a single 12V group 31 deep-cycle gel cell. I can usually keep the van running when I'm using hungry tools, so the reduced amp-hours isn't a big deal.
I added an ACR (automatic charging relay) to keep the gel and cranking batteries separate, yet keep the gel battery charged. Pics are in my gallery.
If you really want to stick with 2 batteries, replace one with a deep-cycle, and manage the bank with and ACR and a bridging switch. That way you can bring them both online for cranking, but otherwise keep the deep cycle charged and separate. Blue Sea Systems make some nice products.
Consider your usage though, and the involved installation. A small, cheap generator supplemented by a 100-300W cig. lighter inverter might suit you needs and wallet better.
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95 F350 Crew 5spd/4.10, SuperChips tuner, solid flywheel, T444E waterpump, 205° stat, Locked F&R, 9.00R16 Michelin XLs
97 E350 SRW cutaway, E4OD/D70/4.10, 19.5s on the rear, deep trans pan, batteries inside, 1800W inverter, manual glowplugs
Other rigs I goof around with regularly:
93 F350 4x4, 7.3 IDI turbo, 5spd, 4.10s
90 F250 4x4, 7.3 IDI, 5spd, 3.55s, D60 swap, straight pipe, turned up fuel screw, 9.00R16 Michelin XS
Other Engines I mess with:
Mitsibishi S6U-MPTA
Mirrlees National KVSSM MK-II
DDC/MTU 12V2000
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