Have you ever heard of any business checking your vehicle registration? It doesn’t happen. Besides, if you live out of state you’re not applicable anyway. Do whatever you want though. I have no dog in this fight since I live in Arizona. I wouldn’t be the least bit worried if I brought my bike to Jersey though.
Sigh your awfully stubborn and really don't seem to understand reciprocity and interstate compacts and I'm not going to bother further beyond this last post. Your example is not particularly a good one and assumes much that isn't necessarily true and I'm going to give you a real life example at the end of this that I ran into in my 20's with motor vehicle laws differences between states. Where there is broad agreement on a particular issue states have reciprocity agreements in place that decide how much of what states requires or approves within it's boarders the other state grants to one person from another state unconditionally without requiring further direct compliance. Much of current Motor vehicle law was worked out this way a rather long time ago.
Here is a direct example of a Maryland law deciding how reciprocity the state of Maryland if may grant if they decide to(they don't have to) for Industrialized Buildings and Manufactured Homes:
.14 Reciprocity with Other States.
Upon the application of another state for reciprocity, or upon his own initiative, the Secretary shall investigate if the other state has adopted and promulgated a code and enforcement procedures which establish standards and safeguards at least equal to those contained in these regulations. He will hold a public hearing to state the findings of his investigation and give interested parties the opportunity to submit their comments both for and against the adoption of a reciprocity agreement with the other state. Following the hearing, the Secretary shall decide whether a reciprocity agreement will be granted. As part of the finding by the Secretary granting reciprocity to another state, the Department shall set out the specific terms and conditions of the reciprocity agreement as it applies to that state and manufacturers of industrialized buildings under that state's program. As part of the reciprocity agreement, each state will keep the other informed of any changes in its regulations and maintain a current list of manufacturers that have been approved under its program. Upon application by any person adversely affected by the reciprocity agreement, the Secretary may investigate the allegations, and if necessary, hold a public hearing. Based on the results of his investigation, the Secretary may rescind, modify, or continue in effect the reciprocity agreement.
There is no such animal like this in regards to Ebikes, the state of New Jersey can force me to comply with their law as soon as I cross its border they have no compact they have decided to honor me as a individual from the state of Maryland when I bring my property to New Jersey and they don't have to either. The only time one state can be forced to honor something from another state without their approval is via the Interstate Commerce Clause of the Federal government that as a matter of convenience and good order broadly regulate exchanges between states and their citizens that which has been decided makes life easier for for citizens and businesses as they go about their way moving around the country that there should be uniformity granted wherein.
Here is that real life example using your chosen of motor vehicle laws. In my 20's I spent a year away from Maryland working in North Carolina with original intention of moving there permanently. Establishing residency requirements for NC means I was going to have to get licensed, insured tagged and titled there. Here was the kicker and it took me a month to get worked out because NC and MD's reciprocity agreement did not cover this particular item. NC is a one title state and MD is a two title state. That means if you bought and insured your car there you got a title to the car even if you had not payed it off and didn't really quite own it in full yet. Maryland is considered a two-title (or dual-title) state because it issues a paper Certificate of Title to the vehicle owner while simultaneously creating a separate Security Interest Filing (SIF) document to record any lienholders. When a vehicle is financed, the owner receives the title, but the lienholder holds the SIF, which must be cleared to prove full ownership. Being a little naive like you I explained that to the NC MVA thinking it was perfectly reasonable that they accept what the state of Maryland accepted. They didn't give a rat's ass what Maryland accepted despite the fact that my property the car was bought in Maryland and brought to NC by me. Reciprocity did not cover that and they did not have to honor it. Further more I was forced to go to the bank who had the lein on my car and convince them to provide me with what NC considered a valid title. This actually took some convincing to do with the bank who didn't happen to be a National bank that had branches in NC and did business there. Maryland required this of them and it took me a while to get them to provide me with this and they were clearly uncomfortable with a situation that might not find them not in compliance with MD law.
This is how the real world works in the United States between states and thus endeth the Civics lesson for today.