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Old 12-28-2013, 07:51 PM   #15
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I had the MH weighed today, but it wasn't fully loaded. Overall was 15,420 (GVWR is 18,000). Front was 5,880 (front GAWR is 7,000). Rear was 9,560 (rear GAWR is 12,000). The tire inflation table has a minimum of 80 psi for S 3640 (7,280?), and D 3415 (13,660?). If I'm doing that correctly, both of those are more than the GAWRs, does that mean that I should always use the manufacturer's recommended 82 psi?
Will be taking it to the Ford dealer Monday. After that, am considering the Roadmaster Reflex steering stabilizer ($129) and the Blue Ox Tiger Track bar ($695) at the RV dealer. I appreciate the DIY suggestions, but if you haven't guessed, I am female and, unfortunately, DIY is out of the question.
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Old 12-28-2013, 09:04 PM   #16
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I had the MH weighed today, but it wasn't fully loaded. Overall was 15,420 (GVWR is 18,000). Front was 5,880 (front GAWR is 7,000). Rear was 9,560 (rear GAWR is 12,000). The tire inflation table has a minimum of 80 psi for S 3640 (7,280?), and D 3415 (13,660?). If I'm doing that correctly, both of those are more than the GAWRs, does that mean that I should always use the manufacturer's recommended 82 psi?
Will be taking it to the Ford dealer Monday. After that, am considering the Roadmaster Reflex steering stabilizer ($129) and the Blue Ox Tiger Track bar ($695) at the RV dealer. I appreciate the DIY suggestions, but if you haven't guessed, I am female and, unfortunately, DIY is out of the question.
Yes, you are doing that correctly. So, 80 psi will be more than enough air pressure to carry the weight that you will be actually carrying. Fully loaded you probably won't have more than 6000 lb on the front two tires. However, the two tires on front will carry 7,280 lbs so you have more than enough of a safety factor there. Fully loaded you probably won't have more than 10,000 lbs on the rear four tires. However, the four rear tires will carry 13,660 lbs so you have more than enough safety factor there. Technically, 75 psi in all tires would probably be OK (the chart doesn't go that low, but just guessing). So just run them all at 80 psi cold and you'll be good to go.

I am assuming that your tires are original Goodyear G670 RV tires in the 245/70R/19.5 size.
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Old 12-28-2013, 10:08 PM   #17
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Never run less than the minimum inflation the tire manufacturer recommends in this case 80 psi if you are looking at the correct tire inflation table for your tire. You risk overheating the tire at lower pressures and tread separation or blowout even though they may ride better at lower pressures. You have already experienced the instability the soft sidewall causes when under inflated. Of the items you listed the rear track bar, even though it is more expensive is the first item to tame your motorhomes handling and really should be installed at the factory when they are built in my opinion. You will not be sorry you had it installed. If you can talk someone into doing the cheap handling fix it will also make a dramatic difference and the mechanical skill level needed to make the change is a 2 on a scale of 1 to 10. Maybe you can talk someone you meet in a campground will make the change for you as it will only take about 15 minutes total and no parts and no special tools. I have made both changes to my coach which is 37 feet long with a long rear overhang and it is literally a one hand operation to drive now.
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Old 12-29-2013, 07:19 AM   #18
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cjlove,

Moving the sway bar attachment to the inside holes makes the bar action slightly stiffer, and this increases resistance to side to side sway. Adding caster to the front suspension makes the steering return to straight ahead quicker. You can certainly have this done at the Ford dealer. It would be good to ask to see the sway bar mounts when the motorhome is up on the lift; both for your own education, and to illustrate to the service manager that you are interested in earning more about your unit.

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... I asked Ford Service about the CHF on the phone, and he had never heard of improving handling by moving the sway bars to the inside holes or by increasing the caster. Doesn't give me a lot of confidence (he's the one who suggested the air bag) but I don't know where else to take it.
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Old 12-29-2013, 01:17 PM   #19
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Caster

I posted a separate thread this morning asking whether I should request the caster be increased if it's at or near the 4.63 spec. (spec is 4.63 plus or minus .75). If I can get it changed, should I request it be 5.3 on the right and slightly lower on the left? I may be posting this a second time, but I can't find my earlier post.
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