As Virgil and Alaric can tell you, there are lighting standards for backup lights. But some of us want more. On my old International 4x4 offroad work truck, I mounted a pair of sealed beams inside the 6" channel bumper, then another pair of sealed beams a good six feet off the ground. Both sets are on manually switched circuits. Out in the woods I wanted "headlights on the back" for maneuvering, plus I wanted work lights. This setup, combined with a bed light (from the now defunct Airborne Sales) that started life as a fuselage light, took care of my needs. But it was ONLY used out in the woods, and 200-300 watts of sealed beams (depending which bulbs were installed at the time) is sort of a brute force approach.
The old ex-Navy 1966 Cornbinder is now on jacks and probably beyond restoration, so the current workhorse is a 1986 F250. On that, I replaced the original tail/backup lamps, installed those #796 replacements for 1156, then (because I'm not shy about cutting oval holes in my step bumper), I put in a pair of LED backup lights Virgil recommended (which work well, even after I backed into a tree stump right over one of the lights, while skidding logs). I added a manual switch and 10 gauge wiring, which really jumped the voltage at the bulbs. So far, this has been meeting my needs for backing up and for loading/unloading and hitching the trailer at night, but floods mounted atop the cab protector come next. I'm probably at the limit for legal backup lighting on public roads. This is why I like additional lights on separate circuits that I only turn on out in the woods.
We are fortunate now to have so many different LED auxiliary lights available. My suggestion is to get the best possible bulbs for your stock backup lights, then carefully investigate the feasibility of adding any more lights without exceeding the legal backup lighting restrictions. Then add additional offroad floods if desired - on a completely different circuit. There are so many different small lights and LED "light bars" today that with a little research you're sure to find something that fits your available space. Gone are the days when every other backwoods hunter/camper just stuck on a pair of PAR36 tractor floods. But again, I'm a big believer in a separate circuit for those, so your vehicle's reverse lights stay street legal but you can switch on some serious floodlights when working out in the woods.