We have a 21ft. Toy Hauler....love it....I am with you I like my bed to haul camping necessities, extra water, gas etc. Toy Haulers are the way to go if your going to purchase trailer...A bit more pricy but maybe find a preowned one in good shape...
Nice thing is Toy Haulers usually have 100gallon water tanks, generator built in. Flatscreen tv, I purchased a 12volt TV with dvd at Camping World for our Grandson to watch movies at night without needing to run the generator Also purchased LED lights and installed them myself to reduce 12volt power needs......also installed a reduced water flow 1.5 gal per minute shower head. that has a button to turn off .....soap down then rinse off quick showers no full hookups where we go....I spent some extra money and had the frame reinforced in the area around the axles....I pull my Toy Hauler into places you need 4x4 to get in there....just go slow just got back from a CA blacktail archery hunt...off Hwy took 11/2 hours to get it into camp....13 miles off Road....have fun you will love it...
You have many options now to convert existing lighting to LED some just plug into existing fixtures convert at least one main light inside and all the big out side lights....simple just plug it into existing socket.....good luck