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Old 12-22-2014, 08:46 PM   #1
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Distance between drive axle and tag axle

If it's handy I wonder if someone with a tag axle motor home could measure the distance between the middle of the tire contact on the ground with the tag and the drive axle. I currently own a single rear axle MH and have one with the tag ordered so am trying to measure out a concrete pad for the new one. I know the length of the coach and the wheel base measurement but don't know how much to allow for the tag axle tires.
Also, anyone who has poured a pad for their coach how much extra width over that of the coach is really necessary for a nice pad.
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Old 12-22-2014, 09:53 PM   #2
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Quote:
Originally Posted by wagonmaster2 View Post
If it's handy I wonder if someone with a tag axle motor home could measure the distance between the middle of the tire contact on the ground with the tag and the drive axle. I currently own a single rear axle MH and have one with the tag ordered so am trying to measure out a concrete pad for the new one. I know the length of the coach and the wheel base measurement but don't know how much to allow for the tag axle tires.
Also, anyone who has poured a pad for their coach how much extra width over that of the coach is really necessary for a nice pad.
First, you need to find out how the manufacturer determines wheel base. Some use the distance between the steer and drive axle with the tag being extra. Some measure from the steer to the trunion (midway between the drive and tag axle). To be safe just make the pad as long as the coach or even 10' longer. For width, I personally would want at least 3' extra on each side. I have an RV port with just a packed soil/gravel base. No issues in 10 years.
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Old 12-22-2014, 10:55 PM   #3
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All I'm going by is the literature says the wheelbase is 252" + tag. I'm not sure I will have room in the back yard to do the length of the coach let alone go an extra 10', maybe just a couple of feet extra on each side. Wish I had the room to do as you suggest.
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Old 12-23-2014, 07:44 AM   #4
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All I'm going by is the literature says the wheelbase is 252" + tag. I'm not sure I will have room in the back yard to do the length of the coach let alone go an extra 10', maybe just a couple of feet extra on each side. Wish I had the room to do as you suggest.
I am not where I can measure my tag, but a good method would be to measure the diameter of one of the wheels and add 10" for separation of the tires. Calculating a 295X80/R22.5: 295 x .80 x 2 = 472 mm. 472 divided by 25.4 = 18.6". 18.6" + 22.5" (the wheel) = 41" for the tire diameter. Add 8-10" for separation and it comes to 50". So steer axle to tag axle is 252" plus 50" for 302" center to center. A 275x80/R22.5 will be 1" less in diameter. That is close, as I have heard that a tag will add 4' to the wheel base.

Hope this helps.
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Old 12-23-2014, 04:17 PM   #5
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Thanks Crasher. That separation measurement was one I had no idea what it might be. Four feet will give me a very good idea for how much extra room I'll need if I decide I have room for this project. Wife has been after me for several years to do this instead of always having a bare patch of dirt in our grass.
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Old 12-23-2014, 05:22 PM   #6
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"wagonmaster2".....The 40' Dutch Star measures EXACTLY 40' bumper to bumper, ladder not included. The rear axle to tag axle (center to center) is 48".

My slab is 44' long and 14' 6" wide. A wider slab would have been nice, but mine is parked between the house and a wall. I could make it longer, but 44' was sufficient. With the above numbers I can move around the exterior with a ladder for washing and repairs and get the bay doors open enough to load the coach.
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Old 12-23-2014, 06:08 PM   #7
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I'm not sure I will have room in the back yard to do the length of the coach let alone go an extra 10', maybe just a couple of feet extra on each side. Wish I had the room to do as you suggest.

You have to have the room for the length of the coach........how else is it going to fit 😃

I don't think you want the concrete to stop at the tires......that will leave the engine sitting over dirt !
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Old 12-24-2014, 11:01 PM   #8
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[QUOTE=Dutch Star Don;2355021]"wagonmaster2".....The 40' Dutch Star measures EXACTLY 40' bumper to bumper, ladder not included. The rear axle to tag axle (center to center) is 48".

My slab is 44' long and 14' 6" wide. A wider slab would have been nice, but mine is parked between the house and a wall. I could make it longer, but 44' was sufficient. With the above numbers I can move around the exterior with a ladder for washing and repairs and get the bay doors open enough to load the coach.[/QUOTE

That would be a very nice slab. I might be able to squeeze out the 40' length but I'm cramped in between a tree on my property and the telephone box in the alley (the slab will have to extend a little out into the utility easement that is not used as an alley). I think all this is probably the reason I haven't done it before. At best it would probably have to be about 10' X 40' or none at all.
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