Around here in the summer you just shower at the show grounds.  You can't get very much hot water outta a small water heater and you'll need more room.  I've been toots of show grounds around here and they don't have water hook-ups unless you run a line to the barns and then people will unplug you when they need water.

Call the show grounds you plan on going to and ask them about their set-ups.

I camp with a club and there is quite a variety of LQ trailers.  I camped for 3 years with a good friend that had bought a 2H Sundowner shell and had amenties installed such as electric water heater & fridge, cowboy shower in the horse area, microwave, AC, cabinets, countertop, sink, etc.  Since hers is electric she has a generator or can plug into 210 (the big plug so I think that's what it is). She also insulated the trailer afterwards which was more expensive and a hassle, but well worth it.  She now wishes she had gone the route of propane for the following reasons:  while driving, her fridge is basically a cooler and she has to keep frozen bottles in it to keep the food cold.  If we don't have electric at the campsite, she has to run the generator to cool the fridge.  Same with AC or microwave. 

   The cowboy shower works fine - she puts the hot water heater on for 30 minutes and we can take 2 showers and have plenty of hot water.  However she doesn't have holding tanks, so the water runs out of the trailer. This might present a problem at some locations and I don't recomend it.  We clean the back of the trailer out upon arriving at the location.

You really need the pass through door so you can shower and then go thru into the DR to dress, etc - running the AC sure makes it more comfortable.  The AC's heat strip doesn't work all that great, so she bought a $15 heater that works on electric and we have to keep it on low or it gets too hot.  Keep in mind we live in Fla. 

She did get a very good onan generator which is fairly quiet, but of course you can't run it at night, so once again the fridge becomes a cooler.  I always bring my own cooler for my stuff.

Hope this helps. 

There are few members on this forum who have done or are in the process of doing their own living quarters in their 4-6' shortwall trailers. They even have websites with their progression photos and I know they would be happy to help you. Maccwall and MBRA18 are two I can think of off the top of my head who are doing theirs and they look very nice!

I think if you did a search on pass topics you could find some more info.

I have a 2h GN with 4' shortwall.
I have, and use, a 'cowboy shower' in the summer.
My trailer doesn't have a gray tank - the sink water dumps on the ground and to date, it's never been a problem.  However, since I will be hauling heavy this summer I'll carry a gray bucket to put under the drain if necessary. (if I have to hook-up at an official 'RV' station)

There's a deep-cycle marine battery mounted under the neck and it runs all the lights and the water pump - it's awsome rigged this way if you don't have access to power!  The truck charges the battery while running.

The electric is wired just like a house.  There's a small breaker box.  We don't use the 110 converter because frankly, there's no need.  All RV hook-ups and 90% of generators are AC power.

I have a porta-potty and it's super easy to use and no holding tank!

As far as cooking, the microwave has been great.  I do have a 'hot plate' in the trailer and have never used it.  I will be putting in a convection oven/microwave this spring.

Click the link below to see pics of our DIY LQ progress.  There's a floorplan in there too!