800 Total Bases in two consecutive seasons.

The most Total Bases (TB) in one season: 457 by Babe Ruth in 1921. So to reach 800 TB in two consecutive seasons, the batter would need at least 343.

https://stathead.com/tiny/ICKL1

For single seasons, Playing in the AL or NL, in the regular season, requiring Total Bases >= 343, sorted by descending Total Bases.

322 records were put into a spreadsheet (800 TB consecutive years):

https://docs.google.com/spreadsheets/d/e/2PACX-1vSoD-p-4EXKRT1HcOICkwpDA0Vs5fxnz6fAi8IXqyC_7-RQwDTN911qACGSiExKSwqS_ftE_BYmLCHm/pubhtml

It has three tabs:

Answer: extracted from tab 343 TB

343 TB: sorted by player and season

400 TB: sorted by player and season

Here is the summary data in the Answer tab:

Rk	Player	TB	Season		Age	Team	Lg	G	PA	AB	R	H	1B	2B	3B	HR
54	Babe Ruth	388	1920		25	NYY	AL	142	617	458	158	172	73	36	9	54
1	Babe Ruth	457	1921	845	26	NYY	AL	152	693	540	177	204	85	44	16	59
25	Chuck Klein	405	1929		24	PHI	NL	149	679	616	126	219	125	45	6	43
4	Chuck Klein	445	1930	850	25	PHI	NL	156	722	648	158	250	143	59	8	40
5	Jimmie Foxx	438	1932		24	PHA	AL	154	702	585	151	213	113	33	9	58
27	Jimmie Foxx	403	1933	841	25	PHA	AL	149	670	573	125	204	110	37	9	48
3	Lou Gehrig	447	1927		24	NYY	AL	155	717	584	149	218	101	52	18	47
154	Lou Gehrig	364	1928	811	25	NYY	AL	154	678	562	139	210	123	47	13	27
10	Lou Gehrig	419	1930		27	NYY	AL	154	703	581	143	220	120	42	17	41
18	Lou Gehrig	410	1931	829	28	NYY	AL	155	738	619	163	211	119	31	15	46
82	Rogers Hornsby	378	1921		25	STL	NL	154	674	592	131	235	152	44	18	21
2	Rogers Hornsby	450	1922	828	26	STL	NL	154	704	623	141	250	148	46	14	42
15	Sammy Sosa	416	1998		29	CHC	NL	159	722	643	134	198	112	20	0	66
37	Sammy Sosa	397	1999	813	30	CHC	NL	162	712	625	114	180	91	24	2	63
64	Sammy Sosa	383	2000		31	CHC	NL	156	705	604	106	193	104	38	1	50
7	Sammy Sosa	425	2001	808	32	CHC	NL	160	711	577	146	189	86	34	5	64
6	Stan Musial	429	1948		27	STL	NL	155	698	611	135	230	127	46	18	39
68	Stan Musial	382	1949	811	28	STL	NL	157	722	612	128	207	117	41	13	36
24	Todd Helton	405	2000		26	COL	NL	160	697	580	138	216	113	59	2	42
29	Todd Helton	402	2001	807	27	COL	NL	159	697	587	132	197	92	54	2	49

Eight players, including Gehrig and Sosa twice each.