Weekend Warrior FS3000 Upgrades?

I have a 2004 that I got for a steal in 2010 bank repo 10.5k, lets see, Ive done the oxygenics, single handle shower valve, new bath and kitchen faucets, reverse osmosis and DI water system and water softener (for the crappy water in Parker AZ), also installed an outside hose bibb to wash the trailer.quads,boat etc using the DI spot free water, porcelin toilet, new stereo,portable XM radio dock and bluetooth,subwoofer under the couch, 8" marine outside speakers and speaker selector switch, TV in front bedroom and Liv room,Directv dish mount, solar panels, pure sine inverter and 11 cu ft residential fridge (with icemaker) and it gets cold in one hour vs a day, 6v golf cart batts,replaced air conditioner and added 2nd air conditioner in the front bedroom and made a 50 amp splitter cable, memory foam beds, split most overhead cabinets by installing shelves in the middle of them. Took out carpet and checkerboard vinyl and installed one continuous sheet of linolium from front to back. LED lighting inside and out including the flood lights, we-boost cellphone amplifier system. And last year got the frame and outriggers (sagging walls) strengthened by VIP rv (trailer is solid as a rock now), got insurance to pay for a good chunk of it. My original WH still works, my genny has 700+ hours, I changed my water pump to a higher GPM shurflo and keep the original for a spare. I also shortened the sewer dump pipe because if you need to use a "blueboy" thoe outlet was too low. Still have 16"rims and tires to add and maybe dexter ez flex. If you need some tips I know the WW FS3000 inside and out. I'm a plumbing contractor as well, tankless or regular is your choice, tankless is about 3 times the price.