Hey Luv2Q, glad your 4.6 Tundra/Rpod combo is working out well for you. We really enjoyed our Pod for 5 years, but with growing grandkids, we kinda outgrew our RPod. We moved up the ladder with a huge (heh, heh) 21' 4700 lb wet Kodiak. The Tundra still works well with this trailer, and I still have success with towing in S5 or S4. In fact we towed the S/W region this past fall, and pulled all of the area's hungus climbs very well--albeit most in S4 with some drops to S3. Also the extra size/weight of the Kodiak has kicked back our towing MPG a mile or so per gallon (usually now 9.6 to 12.5). So, don't be afraid to go a little bigger with your 4.6-- within reason.