GrandmaG, That would have been a great idea, to take photos as we constructed the project, never thought about it at the time, but do need to get it done for insurance. Will pass on some links for possible similar ideas, a couple of the examples are essentially the same type of cart/box on wheels we have now. The GoPlus is one;
https://www.amazon.com/dp/B07F7VM9W2/ref=sspa_dk_detail_4?psc=1&pd_rd_i=B07F7VM9W2&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=21517efd-b385-405b-a405-9a37af61b5b4&pd_rd_wg=Evfsm&pf_rd_r=AJTXTQ79AQHTWCEFEJ5C&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&pd_rd_w=0uMJB&pf_rd_i=desktop-dp-sims&pd_rd_r=cc9a1c96-dfb0-11e8-adc8-9775f9affe9dDeWalt has so very many to choose from;
https://www.amazon.com/DEWALT-DWST08204-Tough-System-Extra/dp/B005HNJR0E/ref=pd_sbs_469_6?_encoding=UTF8&pd_rd_i=B005HNJR0E&pd_rd_r=cc9a1c96-dfb0-11e8-adc8-9775f9affe9d&pd_rd_w=kutao&pd_rd_wg=Evfsm&pf_rd_i=desktop-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=7d5d9c3c-5e01-44ac-97fd-261afd40b865&pf_rd_r=AJTXTQ79AQHTWCEFEJ5C&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=AJTXTQ79AQHTWCEFEJ5CThe Stalwart stackable is economical but may be a bit narrow,
https://www.amazon.com/dp/B0054PD2QU/ref=psdc_13400721_t2_B00KU75ANUand,
https://www.amazon.com/dp/B01N1H4N5X/ref=twister_B07F6WR6CC?_encoding=UTF8&psc=1#productDetailsand the wheels are big enough to handle the loads.
Last, here's an idea like what we found to carry a couple bodies and lens on de plane, never check your camera/lens, they tend to disappear;
https://www.amazon.com/dp/B0054PD2QU/ref=psdc_13400721_t2_B00KU75ANUSaw one like this at target for about $59, they all should have TSA locks, but that doesn't equal protection from baggage folks. Black Polycarbonite is nice, or you can save a bundle and get some really tough ABS. Beware of brittle-plastic shell items that look nice but can shatter if they fall over. The rim should be sealed and it's helps if the inside is what you want, and the handle/wheels will hold up. $100 seems a lot compared to $59, depends on your taste. A weather proof canvas or leather sling-bag is what I used in the mountains/hills, with a holder or harness rig, long ago when I could pack all of that.
Few of these were really long links, but as always, Amazon has zillions to choose from. Names like Keter, Chicago tools as well as DeWalt can get very expensive for stackable storage, there are so many modular cases. At times the local prices wind up being much lower locally, so can save you money. The GoPlus stack (above) is similar bit smaller than the DeWalt I found. Glad others showed their DeWalt rigs. You can trick them out as much as you want. I'd thought about putting a Nikon sticker over DeWalt, but as others mention, not many folks would mess with a big toolbox, unless they love tools. Some years ago I started with a generic, black plastic trunk, strapped to an upright 2-wheeled cart; that old rig cost total only about $30. One of those huge Coleman-style coolers offer a lot of protection; saw one fall of a truck once, cracked on corner and shook up the unpadded beverages inside, but everything survived.
Encouraged Wife that instead of a heavy purse, she might want to try a leather, camera shoulder-sling bag. Many of those have more compartments than her purse. When she asks me to hold it, it weighs as much as my loaded camera bag and has only three dividers.
I used to be proud of the gear I used to pack around when I was in the business, (still am), and never thought much of pulling out a folder with photos showing locations and people I'd shot, including my lovely lens/bodies used. At a family reunion one relative over in the corner was bent about something, and began whining that too many people were overly prideful/narcissistic/selfish/capitalist, jerks, etc :)P (so...) Rather than engage in useless, snarky debate, I pulled out the Nikon with a 300mm and asked if she'd mind taking a group photo of the folks, as I usually got asked to do the honors. She turned multiple shades of purple, huffed/puffed, turned up her nose and whipped a cell phone out of her cavernous, diaper-style bag. She didn't get the joke, but everyone else got a kick out of it. Everyone should do what they like and do it well. Never worry about those who constantly find fault or put you down because they don't get your point of view. Happy shooting all. sv