IRL i'd have a bit more than 3 beacons on my truck :
2 x on roof / or a bar
4 x on the grill ( well, they'd be leds, but since scs haven't added those for some strange reason....)
2 x on the rear of the cab, high up ( still would be leds, if scs got their .... togheter, and added those )
And usualy 1-2 x on the rear of the trailer, though, those aren't on the truck, so wouldn't really be counded here.
Ingame, i'd love to have 2 on the grill, and a bar on the roof (does that count as 3?), but, last time i checked, grill lights was banned
Though, i do understand the lag point of wiev ( it's possible to disable beacons in the options though), and respect that. Not everyone has a gaming rig, so it's not really a big problem for me, i'll just leave the bling bling to sp
edit :
This one got a roofbar, and 2 leds on the grill ( in addition of the flashing led sign )