The license plate bracket is sturdy enough to not worry. If you lost your temp tag, perhaps the bolts weren't tightened? Simple solution: nylock nuts.
https://www.amazon.com/Stainless-Nyl...44265744&psc=1
Temp tag suggests new...or new to you.
Speaking of stainless, lay in an inventory of stainless screws, bolts and nuts. If and when a screw backs out (you find it on the floor), upsize the screw and add a dab of Gorilla Glue to the threads before you install it. This is the equivalent of LocTite on nuts and bolts. Get the minis for "single use".
https://www.amazon.com/Gorilla-Origi...l%2C228&sr=8-3
If you boondock, as your HW-277 (my previous rig) encourages you to do, things vibrate apart. You can fix them on the fly with a small hardware kit. I recommend stainless because it can be used inside or out, and it's compatible with aluminum and steel.
If the rivets in your stairs start to give out, replace them with 1/4" bolts, washers and nylock nuts...all stainless.
If you're fussy, bring a can of black spray paint. Before you put in the new screw, screw it into some cardboard and paint the head. Let it dry, then install.
My HW-277 gave me many years of wonderful service, but you must expect to perform some field repairs unless you only go on paved roads. Gravel roads tend to shake any camper apart...it goes with the territory.
The stairs on a HW-277 are vulnerable to grounding when off-road. I lifted my rig to solve the problem. But a new, better solution might be something like this Morryde Step.
https://www.amazon.com/Lippert-Compo...xpY2s9dHJ1ZQ== It folds completely into the camper. My stairs were very vulnerable, and when going off-road, I'd carry a sledge hammer to straighten them upon arrival. (photo) When I bought my new rig, I bought the fold-away stairs as part of the deal, then I installed them myself. I don't know if they make them narrow enough for a PUP, but they might. I absolutely love mine. You can see them in the photo of the Jayco. WORD OF WARNING. Note the straight rails on either side of the step. Be vigilant to not step on those, or it's a fast ride to the ground. It took me two hard lessons to pay better attention.
Finally, if you boondock, solar is great. I put 100 watts on the roof of my HW-277, and with frugal use of power, I could go indefinitely without shore power. That's an entirely different and detailed subject, so if you care to pursue it, let me know.
Meanwhile, unless your license plate bracket broke off, the solution is nylock nuts.