If you are assigned to Government Quarters there may be 110 power. Long ago they were all 220, requiring transformers, 1600w was biggest popular size. If you find you do need transformers, go to the $ Thrift Shop, not $$$$ AAFES. Your HHG weight allowance is determined by the Sponsors (your wife) rank, assuming she is active duty USAF. Weight overages are billable to the sponsor, was 99 cents a pound, dunno what it is now a days. You can ship one vehicle at gov expense over and back, it does have to pass cleaniless inspection.
With renovations over the years, 110 power in Government Quarters is common. On the down side; no garage, One assigned parking space, a basement storage Room about 10 x 10 if you're lucky. Governement Quarters are large apartment type buildings, typically with 3 stairwells with 6 to 8 apartments per stairwell, usually with a "patio", unless you get in a "hi-rise". # of bedrooms in quarters vary from 2-4, usually based first on family size, then rank.
If you have to take Economy quarters with a host nation landlord, be very very careful. Make sure you get a English translation of the contract. Be sure you know who pays the taxes on the rooms. German apartments DO NOT have closets as they are in the good 'ol US of A. They use a "Wardrobe", fancy name for a wall locker, there are other subtle differences also like the way they heat water for kitchen or bath.
When you get there try to attend the Newcomer Orientation, Gateway. Their customs are different than what you're probably used to. I got a ticket for pulling weeds in a flower bed on Sunday, knew better, got bored and forgot. I saw another American get a ticket for letting his car run in the winter while cleaning the windows. Also, don't throw snow on the lawn, they will fine you if caught. The Poliezi all speak english, and most of the time it'll be 40 euros and "we'll forget it", yep, you pay the cop!
There are Auto Craft Centers run by the MWR on most bases which have most of the tools you'll want to use, compressor, lift, oil change bay, etc. They even have people who are there just to offer assistance or advice. There are also wood craft shops, and Craft Shops for macrame, oil painting, pottery, etc. Speaking of oil changes, Germans are very strict on waste oil disposal cause it contaminates so much of the ground water.
I'd leave the big items with a trusted relative, not in a storage facility, especially if you're going on an extended tour. Take or buy a good quality camera, get out and see the continent, go exploring and have a great time.