Hello Historians, as the title says I would like to know about pre-christian Germanic funeral & burial customs from around the years 500 to 1000, specifically Norse, Continental, and Anglo-Saxon customs. I am a reconstructivist Norse Pagan, so the Pagan rites of the past are of particular interest to me. In particular, I would like to know about commoner vs noble burials, mound burials (specifically the mechanics of making sure the person buried inside would not be exposed via erosion), grave goods, funeral rites, and rune stones.
I do have some preconceived notions about this topic, which may or may not be true. From what I understand, nobles would be buried in their own mounds, commonly with weapons, armour, and ships, while commoners might be buried in familial mounds with some of their possessions. Rune stones may be raised around where the person was buried or on other family property, especially for richer families.
That's basically it, I look forward to reading your responses.
Sorry for very late response, but put it simply, I afraid that your question is too big to answer here (time span between ca. 500 years as well as comparisons among the three regions).
As is often repeated in this subreddit, such as /u/Platypuskeeper's Homogeneity section in How much do we actually know about the ancient religious traditions, deities and narratives of the Norse?, researchers now agree that it would be not so easy to reconstruct uniform 'Norse' religion even only during the Viking Age (ca. 800-1050) (Cf. Nordanskog 2012), and burial customs of the Norse people epitomize this diversity. One recent hypothesis is that different local (small) groups of Scandinavians adapted their own burial customs (Cf. F. Svanberg), thus the different practices can be interpreted primarily as a kind of local socio-'sub-ethnic' identities within hitherto not politically unified Scandinavia.
I hope that this map (Christiansen 2002: 287), showing the regional variation of dominant burial customs in Southern Scandinavia during the 10th century only, illustrates the problem that I touched above. Even the most basic distinction for the burial between inhumation and cremation was not uniform in the area that would largely be integrated in medieval kingdom of Denmark.
As for the Anglo-Saxons, the recent answers of /u/BRIStoneman and /u/Platypuskeeper in Why are hammer pendants not found as often in Anglo Saxon areas as they are in Scandinavian and mainland Germanic areas? and why are spearhead pendants not as common as hammer pendants? are worth checking to understand the circumstances while I suppose to ask some concrete examples of the Anglo-Saxon pre-Christian burial practices in the 6th and 7th century is a totally valid question (whether we can generalize them as 'the burial custom of the Anglo-Saxons is another matter, though).
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Rune stones may be raised around where the person was buried or on other family property, especially for richer families.
It's true that mostly only the richer Norse could afford the commission to erect the rune stone (rather one than two or more at one time, I suppose), but the social function of the rune stone in the Late Viking Age was to commemorate the dead, not necessarily the tombstone itself. The family of the dead commissioned to erect the stone, in a sense, to 'advertise' the deeds of the commemorated person in their vicinity. Thus, many rune stones are now found in the graveyard of the church or the former local assembly site where many people regularly visited (Sawyer 2000: 10; Sanmark 2017: 144-47), not limited to the estates of the diseased/ the commissioner.
It should be also underlined that such a social function of the runic stone to commemorate the dead was mainly attested in the end of the 1st millennium and many of the commissioner were in fact the Christians. In other words, if you wish to ask primarily about the practice of the non-Christian Scandinavians in ca. 800 or older, I'd rather not say to raise the runic stone for the read was typical among (non-Christian, then) Scandinavians.
References:
(edited): fixes some styles.