I have an 18 1/2 ft util trailer, a 7x12 dump trailer, and a lumber/utility rack on my crew cab short bed F-250 Super Duty. Since getting/installing the Harbor Freight rack I use the trailers about 1/3 to 1/2 as much. Way less hassle with rack. I carry 20 ft lengths of steel, pipe, lumber etc.If the material is super floppy I put a board or two up with it and tie them together to reduce/eliminate floppy bouncing.
Although I have hills/slopes that make loading into the util trailer or dumper easier they are not where it is convenient so building a loading ramp is on my list. I will make a front and sloping sides out of concrete and fill with rocks, debris, and dirt with crushed limestone gravel with fines (crusher run) on top for all weather ops. I will put "weep" holes in the concrete wall to drain any accumulation water so as to avoid build up of hydrostatic pressure.I may opt to build the loading dock/ramps as a grease pit to facilitate oil changes and inspection/work on bottom side of wheeled gear.
As regards coals vs vac... There is a commercially available metal bucket (5 gal I think) that you put upstream of your vac. It catches the debris before it goes to the vac canister. So if there are any coals they are trapped in this metal bucket where you may cap them off air tight so they go out for later safe disposal.
On my list is the job of a DIY copy of a small cyclone filter made of metal to safely vac live coals, essentially a metal version of Oneida's "Dust Deputy."
Link to Dust Deputy:
Buy Oneida Molded DIY Dust Deputy Cyclone at Woodcraft
"Borrowing" their design but fabricated in metal should not be too tough. It will keep nearly all the fire residue out of the shop or wet/dry vac and its filter. I have Oneida's full sized cyclone system, a 3 HP Dust Gorilla and it works super. I expect a scaled down version to work well too.
Although I have a couple 25 ft 2 inch vac hoses that reach anywhere in my shops by plugging into the dust collection system's distributed inlets I still could use a Dust Deputy or two but am too cheap to pay their price, hence the DIY plan.
Oh, both the above listed trailers have ramps and built-in ramp storage but... the ramps are darned heavy so I will build the loading dock and only have to use the ramps away from home.
Note to guys using boards for ramps: Making the boards wider by 3-4 inches or more is NOT an efficient approach. Better to add a 2x4 or 2x6 at right angles to board ramp (a little shorter than ramp for clearance at the ends) on the underside of the ramps near midline of ramp. Adding the same amount of wood here is far better than adding width.
...and finally... great job building those shelves you guys. Good on you!
Patrick