I am so glad that we could not get a shower in a 13Standard when we bought our 13Deluxe.
There are so many things which make it worth the cost.
Everything from better cushions and more choices, to custom cabinets all around, to two drawers. The whole trailer is quieter plus things like the water pump, sump pump and furnace
, (even the shower) all run quieter.
Not that the Standard is too noisy.
The $3000 premium for a Deluxe, is actually only about $1500 when compared to a comparably accessorized Standard.
We have had ours for 10 years now and we still find nothing on the market which could take its place except another 13D!
Today I have a front bath Standard in my shop, parked right next to my 13D. The Standard is five years newer than our Deluxe and has had many upgrades over the last two weeks.
Both are very nice trailers but the Deluxe still stands out.
As for the effects of any imagined weight
We have towed our Deluxe containing lots of mods and every option (except two propane
tanks) all over the U.S. with a 4CYL Ford Escape
with no ill effects and fuel economy in the mid twenties.