I do not know of any LT or XL rated tires in 215/65-15. With a load index of 96 it is a marginal fitment especially for a loaded camper. The higher speed rating does help as long as the tire is rated to take the higher air pressures. 
I would match the front and rear with this size. You will be surprised at the improvement. 

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of SDF ( aka ;jim lahey' - Scott )
Sent: Thursday, July 16, 2015 2:59 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: [WetWesties] Crazy Idea On Mismatched Tires

keep those 205'65 R 15's in front ..run 215/65 R 15's in the rear.
Great combo.
the rears should be C load rating, or D load rating, or ....in my case I have H speed rated rear 215/65 R 15 's and love the combo.

not practical to change 3rd gear in a automatic I believe..
but there is a slightly higher ring and pinion ratio , somewhat rare, Eruo only I believe.

On 7/15/2015 5:53 PM, Loren Busch starwagen@gmail.com [wetwesties] wrote:
> Okay, this wacky idea popped into my head while driving today.
> I now have a 2.3L WBX with a lot more power in my '90 Westy with 
> automatic.  I could (but cannot possibly afford) go to a higher 3rd 
> gear in the auto tranny, adds say it would drop the RPM at cruising 
> speed by 800 RPM. And thus save some gas on long highway runs.
> But what if I did this?  Go to larger tires on the rear? Why only the 
> rear?  To keep the speedometer and odometer accurate.
> Right now I am running 205/65 R 15 all around.  If I were to go to a 
> tire with larger circumference on the rear, although loosing a little 
> power at the ground I should drop my RPMs at cruise.
> So, is there a fault in my logic?  And would my gain be so small as to 
> not be worth the effort?  BTW, I haven't tried to do the math on this 
> one yet, just thought I'd throw it out.
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