Aluminum for a BBQ/Smoker cart

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Hi folks.This is a little OT, but maybe not.  I'm a pretty newbie-ish welder, most of what I've done has been with 1/8" thick aluminum creating a battery frame for an electric motorcycle.  That was a combo of angle aluminum, square tube and rectangular tube. I've also done a kitchen table that was 1.75" x 1/8" thick aluminum square tube in a simple box-like frame.I've also done some steel (1/8" plate and angle) mainly for mounting the aforementioned battery frame to the motorcycle. In any case, I've got a new project, creating a rolling cart for a BBQ/smoker. This smoker is about the size of a small refrigerator (27"W x 24"D x 38"H) and weighs around 275 lbs. I've done some searching on the web and found some decent designs, and have created a drawings (attached at the bottom of this post), of a potential design. My gut feeling says that this should is overbuilt and thus is strong enough if i can create decent welds (which i can...most of the time).  The orange tube (1.75" square tube aluminum, 1/8" thick) will be mitred together and I was planning on welding three surfaces (top and bottom butt welds, inner corner fillet weld).  Everything else pretty much is butt welded.  Again, this is a gut feeling, so i'm wondering if anyone has any other ideas or gut feelings about the strength of this (my main concern would be the middle of the span between the wheels on the long edge).  Other options are put more support in or another set of wheels, or to do this in steel (probably smaller tube though).  Thanks! Attached Images