I have a few minutes before football starts and I will relate a story and what originally gave me the idea for "building my own"! I have a friend who was a vocational welding instructor at a local high school. He also had a small welding shop. After he retired from teaching he ran the little welding shop until his wife got very ill and passed away. Kids grown and out of the house, he figured it was time to move on and fish and see the world. I knew him basically from fishing, I helped him pick out a boat and taught him a bunch about back-country fishing.
Anyway - he sold the welding business to two of his students. The business had two small box trucks to deliver product and take welding machines to a job site each had a generator (diesel underneath the frame) and both had a lift gate for lifting heavy welding projects. The guys that bought the business had no need for two trucks so they didn't want one of them. They kept the older of the two for financial reasons.
the newer one was an 20' box on an Isuzu cabover truck. My buddy was going to sell the truck, but he used it often to tow his boat. He met me in a remote area of SW Florida with the truck and boat, there were no places with occupancy except a campground, so we set up in the campground and slept in the back of the box truck....The idea was sprung.
He literally built a studio apartment in the back of the truck. A couple unique features he put on are listed below. Forst he framed out the entire interior with 2 x 2's and insulated the walls and roof. It rained while we were camping in it and it sounded like sleeping in a drum, so he put stringers across the roof, arched to match the metal roof and made the stringers 1/8 inch smaller then the thickness of the hard styrofoam insulation he was using, he then put the insulation between the stringers and screwed up 1/8th inch drywall, in effect when he tightened that down hard to the stringers it compressed the styrofoam very firm against the metal roof and stopped the vibrating noise from rain. He used the same method on the walls. He put in a full sized shower and bath with tile floor and walls, used laminate flooring for the rest of the apartment. Being a welder he fabricated fresh water tanks and waste tanks to fit under the truck and plumbed it with standard RV waste disposal fittings so he could go in any RV park.
He put the back wall in 4 feet from the rear roll down door and put in beautiful glass french doors. The 4 feet allowed him to put his small motorcycle on one side and his outdoor gas BBQ on the other side. He also fabricated a railing and stair system for the lift gate. So when parked, he lowers the liftgate and removes his motorcycle then raises the lift gate, puts up the railings and stairs and that is his Back porch!
He bought a queen sized bed from a toy hauler - the one that raises up and down and it is forward on the driver side of the box and goes up during the day and down at night. The bathroom is on the other side. He put beautiful beadboard on the lower half of the drywall walls and hung a wonderful 42 in flat screen tv directly across from his recliner which is also bolted down to the floor. The galley is fairly small but more than adequate for his needs.
I just wish I had some pictures, he has been on the road with this unit now for over three years and of course he has added other little niceties along the way, but when he built it, it was pretty well thought out. Of course it has a rooftop A/C unit and a 50 amp electrical hookup and all the appliances are residential. Full sized fridge, micro wave and a nice 4 burner RV propane stove and of course the propane BBQ on the back porch. He installed som every nice thermopane windows on both sides, but when you put the roll down door in the back you would have no idea it has an apartment inside.
Towing his boat he averages about 16mpg and without the boat he gets 22 plus. Keep in mind this truck was made to haul 20 thousand pounds and he is no way near that with what he built.
Just passing along a nice story. I am going to email him and see if I can get some pictures.
I want to do basically the same thing to a 5th wheel cargo hauler!
Enjoy,
Jim