Does seem a bit Ott for a garage roof , your not going to moving about above that very easy so as said just slide in where needed , the trusses should hold anything your gona put up there .
Get your saw out, put a couple of crossmembers in, and chuck in a loft ladder. Then you can cart your t&g flooring up the stairs. Exactly what they/we did in our place.
Ah - garage roof! I thought you meant your loft. I wouldn't bother with T&G then. I just use old random boards, hooks and straps. If there's not enough room to get up there you'll need to get at it from below. There again my garage roof space isn't the most well organised (Double garage, but unfortunately too low to get the camper in)
A pic of my orifice, which looks much the same as yours. Been up 40 years, and hasn't fallen down (yet).
Truss roofs are incredibly strong because of the engineering in em (triangulation) You will not hurt the trusses unless you fill the whole lot with lead or similar. The weakest bit will be the boarding itself which is why I said to put some timbers in the opposite way to the trusses to spread the weight, not to the trusses so much but to the flooring. Ladder access up the through the very middle (high point) gives you easier access to your stuff, but you would have to keep your car outside when your getting up there. Because of the whole triangle shape of the roof, it’s pointless boarding it out to the eaves because you are limited with height as you get close to the edge, leave it maybe two or three feet short, I’d try to make it board size 2.4 but a little kerb made of off cuts might help too. If you put your access to the side of the garage in the high point, you’ll be able to get up there perhaps without moving your car but you’ll have to leave a pathway clear to get to your stuff on the far side, so less usable space. Cross timbers could be 4X2 or 5X1 with a few chocks to stop the dominoes effect. Ozziedog,,,,,,, we’ll need pics when it’s finitoed
That's one of my early prototypes...but my boys are now too old for skateboard lights in their bedrooms.
Should be fine. I found the t&g boards easier to hump up there, but the trusses had a plasterboard “ceiling” in place already.