Here is a concise summary of the text:
**Amphibious Luxury RV**
* Owners: John and Julie Giljum
* **Unique Feature:** Transitions from land to water in under 5 minutes, combining a luxury motorhome with a houseboat
* **Key Design:**
+ Aluminum boat hull with custom-built luxury coach on top
+ Retractable pontoons (production model) for stability in water
+ Single engine with dual transmissions (road and marine)
* **Amenities:**
+ Spacious interior with slide-outs, teak woodwork, and high-end appliances
+ Full kitchen, Jacuzzi bathtub, queen-sized bed, and 6-ft rear swim deck
* **Limitations:** Designed for calm waters; not recommended for open ocean or rough seas (max 3-4 ft waves)
* **Future Plans:** John aims to build a fleet of these amphibious RVs, made to order.
Here are the key facts extracted from the text, each with a number and in short sentences:
1. **Location**: The amphibious RV is located near Hilton Head Island, on the May River.
2. **Owners**: The owners of the amphibious RV are John and Julie Giljum.
3. **Family Involvement**: Their children, Ivan and Joanne, and grandson Colton, are also involved/associated with the project.
4. **Ivan's Role**: Ivan helped with the outfitting of the RV, earning him "roof diving privileges".
5. **Design Basis**: The RV is built on an aluminum boat hull, with a custom-built luxury coach on top.
6. **Unique Feature**: The RV has retractable pontoons (in the production model) for water stability.
7. **Transition Time**: It takes under 5 minutes to transition from land to water.
8. **Engine Mechanism**: The RV has a rear engine power takeoff, driving both the normal transmission and a marine transmission.
9. **Operation**: The driver can switch from land to water mode by putting the road transmission in neutral and shifting the marine transmission into gear.
10. **Design Intent**: The RV is designed for calm water sailing, similar to a houseboat, with limitations (e.g., 3-4 ft waves).
11. **Control Panel**: The driver has a larger-than-usual control panel with instruments for both land and water navigation.
12. **Safety Features**: The RV is equipped with an automatic fire suppression system, depth gauge, and backup camera.
13. **Interior Features**:
* Full entertainment theater
* Elegant kitchen with residential appliances
* Bathroom with shower and Jacuzzi combination
* Teak woodwork throughout
* Solid granite countertops
* Full residential refrigerator with ice and water
* Trash compactor
* Marble floors
14. **Bedroom Details**: The captain's cabin has a queen-sized bed and a room slide out (30 inches).
15. **Rear Deck**: The 6-ft rear swim deck can be extended by pulling a pin, providing a swim platform.