Mark, if that VW motor would be covered on a warranty at those VW dealerships & independents, then that would be another good option. I can't speak for your customer, but if so, & it's a comparable length 48/48 warranty, then it would fulfill my needs.
Charlie, that's what AAA 200 mile towing is for....on ANY vehicle!
In fact we were in San Diego in `05 moving our daughter out of her dorm for the summer when the Westy top end fried a valve & we had it towed 100+ miles up to my guy at Hans Imports in Huntington Beach for it's last top end rebuild!
AFAIK the GoWesty warranty covers the cost (maybe on a reimbursement basis) when you're on the road & you can have a breakdown serviced at a VW dealer or a qualified indy shop, but GoWesty may need to give you the okay on it in advance.
However, I haven't read the fine print on their warranty nor talked to anyone who has had to use it "off Rez" with them. I would certainly read it & check it out further with their past engine customers, & have my mechanic do so too (he looked at it preliminarily & AFAIK he's using their rebuilds now over his former LA engine shop with only a 12/12 warranty).
Of course in any case - you're depending on the warranty company staying in business & able to honor those warranties, which is another thing to check out, because I'm pretty sure that GoWesty & most others are using 3rd party warranty insurers to cover their work/products.
I'm not close to pulling the trigger on anything now, but I would certainly suggest Mark do so with his customer as one of the alternatives to explore for their adventure.
We also spend a week in beautiful Kingman AZ on an early trip in `90, when my wife dropped the AT into 1st instead of 2nd to make that big I40 grade & bent a valve. It was still under factory warranty back then, but it doesn't cover those types of user errors - nor would any warranty!
Charlie, you & I are both old enough to remember seeing all those cars towing travel trailers back in the `50s & `60s!
....& I do recall seeing many a jack-knife accident back in the days of Lucy & Desi towing! Note to self: make sure the wife doesn't load rocks into the trailer.
I agree, that any heavier use of a vehicle as a TV adds stress & advanced wear, just as does AutoX, DD, TT, DE & other tracking....heck even, street racing - which is which vehicles need maintaining & care. We
may tow 2-4x 200-400 mile round trips a year in this vintage trailer plan of my wife's, so it won't be more than 10-15% of our 3-5000 annual use (& again,
not in the Westy).
Both TVs on my "preferred list" are heavier than our TT at 2800-3000# loaded & that is less than the TVs, 928 is 3505# CW w/ 3527# towing capacity & the Cayenne S is 4800+# CW with a 7700+# TW max, & both have a similarly powerful 4.5 - 5.0+ L & 300+ HP & TQ motor. & with a great independent suspension & big brakes at all 4 corners. Certainly superior to
Our TT would be mated with a Hensley Cub WD/anti-sway hitch & the TV hitch reinforced for the torque of the WD hitch, in order to avoid that jack-knifing you mentioned. And yes, my Dad had taught me that trick to "speed up" to out run the jack-knifing trailer - rather than what most people do - hit the brakes.
Happy & Merry to All!
PS - One of the reasons I decided on getting my used 914 in 1975 after college - over an older `60's 911 or 912 - was it would be my only car & DD, and I'd have to use it on long trips. So I figured that the 914's VW 411/412 based Type IV could be serviced anywhere in the country - even deep in the heart of Charlie's TX - by a VW dealership or independent. In 10 years of DD & trips over 130k miles 12/75 - 5/85, my `73 914-2.0 NEVER failed to get me home & able to get serviced by my guy Hans since `75! Once the clutch cable broke just as I got home from a 1000+ mi trip up north, & I was ready to move it into the garage after unpacking, so I pop-started in 3rd & drove the 1 block to where Hans Imports was from my HB apartment in those days! Cannot beat that kind of reliability!