As far as beds go, there isn't an extended bed. Long
Bed is 8 ft 6 was considered short but no a day it is the standard. There are 5, 4, and 3 foot beds but those didn't come out until after 2000. Most box trucks are on special frames, either done by the manufacturer or altered by a third party company. These are for box trucks, car haulers, and other special needs Riggs. I have seen 10 foot boxes which are made to go in place of an 8' bed but they aren't plentiful and they severely shift up the trucks center of gravity. I wouldn't have it done in this situation as I will limit the vehicles use, cost a lot, and take days to build as I doubt on is available as like I said they are not common.
 
Now as far as the wine goes, it just shouldn't get hot and stay hot. Wine cellars keep wine around 60 degrees to slow aging. As things are it's not that hot out yet where the story is. Crates with dividers could easily hold the bottles. If you want the trailer cooled use a window AC or build a poor mans AC and teach Elsa to control her powers enough to be an ice machine.

Note:
 
The repair shop that would do such things to fix up the truck (ie: the wheel alignment) can do the add-ons at the same time. Shops that recommend each other usually work together, like buying the tanks from one place and installing it on the other.
 

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RPG:
 
“How much you want to put down is on you. Most put down 50%, but while we discuss money, let’s check out the inventory. Maybe something will catch your eye.” Jerry leads her into the Hanger workshop and inventory store house. Moro can see several workers working each of the various projects on various stages of completion, seeing a ratty camper trailer or cargo box being taken from inventory to a work spot where several men and women clean it up and do what needed repairs needs to done to it. This one crew team per unit insures that the job of cleaning and fixing it is done right A simple paint job and new tires are put on at the last step. Jerry leads her towards the rear where the cargo boxes of various sizes and conditions are kept. “You need something insulated with climate control for your wine. Just off the top of my head, a pickup truck can safely hail around 12 tons and anything up to 20ft in length, 9ft wide and 9ft tall but you may not need anything that big.”
 
He points out the cargo trailers from big to small, large and tall 20 footers on one end, going to the short (5ft) 20 footers, to the 18ft, 17ft, 16ft, 15ft, 12ft, 10ft, 8ft, and 6ft cargo boxes of varying heights and conditions parked and stacked up on each other. Above them is an overhead crane on ceiling rails to take them down as needed. He adds, “Price includes cleaning, fixing, new tires and your case a working climate control refrigeration unit. A generator is not included. Prices range from $250 to $80, and the generator is another $120 to $50. It all depends on the size you get and what you add to it.”

Note: Great post. I would not change anything on it, but Jerry would sell a more generic boxes which serves the same function because bottled items of other filled content is sold.
 
But I will hint that there are 2 surviving barrels of wine, which holds about 50 gallons of wine each. Each barrel is 3ft high, 18 inches at top and bottom and bulges out to 2ft (24in) in the middle. They can be sold to restaurants or bars as a whole barrel for around $1000 or more. Or they can be sold at at stand as $1 a glass, $5 carafe and $10 a bottle filled. If 4 bottles makes a gallon, that is 200 bottles or about $2000. But who wants to stand at a table in the market "selling lemonaide at 25 cents a glass?" The wine in the barrels is about 10 year vintage.
 
The only thing I see that is a problem inventorying the wine by its age. You got bottles that are almost 50 years old and the youngest bottle is 25 years old. If the cork did not spoil them or they did not turn into vinegar, they would be the sweetest dry wines around. A bottle of the older ones could fetch $500 due to its rarity and age. The youngest ones can go for $150.
 
I'm throwing a hint in here - Moro needs to think if she needs shelves or secure drawers (or both) as it is not just Maribelle's things that will be stored in there. Who ever is rescued or wants to join in the Exodus to Charlton may need storage space, if this is the plan Moro is going for. The price of the shelves or drawers should be minimal as some such cargo boxes already have them (like current USP Trucks, Electric company, bread & beverage cargo boxes of today). In short, she needs to think long term and what might happen out there. As is, we are more than 1400 miles from Charlton in the Yellowstone area where there are a lot of military bases where each base can be a resettled town surrounded by large-farm communities and Native American settlements.

Note:
 
Quote from Jeanette on Apr 22^nd, 2017, 6:55pm:

 
Barrels were hinted here: http://www.hondosackett.com/yabb/YaBB.pl?num=1428938728/2072#2072
Quote:

Given that, they can be set up vertically to take up less room in a corner of the trailer.
 
Quote from Jeanette on Apr 22^nd, 2017, 6:55pm:

 
If everyone how join brings in their own luggage, then all is needed are shelves in the cargo trailer. And Bungee Cords to hold things down.
 
For example, Marvin, La La and Li Li have their things in cloth shopping bags because they just bought new supplies. They can be put in the put on a shelf on the cargo trailer, though in actuality, their things will be in a storage area under a seat in Karl’s Camper. The issue with this is it’s an open bag, and somebody walking into the cargo trailer can rummage through it and take valuables from it. But like I said before, they will be getting their own vehicle with a camper after Fight Town. For now they are in Karl’s camper.

Note:
 
Quote from Jeanette on Apr 22^nd, 2017, 7:52pm:

 
Granted, as I may have misread it.
 
 
Quote from Jeanette on Apr 22^nd, 2017, 7:52pm:

Of course, but when room runs out of there, things will be moved to the trailer. Plus things like Maribelle’s Make Up Center is not going to fit inside the truck’s bed and cap. It would in the trailer in 1 piece but we are not transporting that thing. That’s why Fernando said to take what would fit in a milk crate.
 
Like Hondo said, the wine is best kept at 60F degrees and most wine cellars are between 40F and 60F, so the refrigeration unit will just cool the air on a low setting (and freeze things on a high setting). It is not like we would be storing perishable food in there, though various food items can be stored in there that can benefit from a cool room, like Cheese, smoked meats/sausages, sacked grains and certain vegetables if she is hauling food to Charlton. But certain things from Maribelle’s clothing would benefit from a chilled room environment, like some of her silk dresses and unmentionables.