Two "controversial" questions...

2" can easily be accommodated for if you want a fiver.
I have a 4" lift on my truck and haul a 21k fiver all over. It may take a little work to get your fiver to ride flat but you can absolutely do it.

I was guessing your 2 controversial questions were:

1) can I run my contractor generator in the campground after 10pm to power my 5,000 watt stereo system?

2) can I pull my 18,000lb toy hauler with my Toyota Tundra as long as its only to the nearest Walmart to camp for the weekend?

Flipping axles will raise the 5er and IMHO, they are high enough. When I got my current TV and fiver I researched and ending up with RWD and longbed. I wouldn't
tow the fiver unless it was level. The trailer weight is designed for the number of wheels on the unit and even one inch up to high will put to much weight on the rear tires.

I have an 06 duramax that I cranked the bars on and added 33's. I'm 4" higher than it was factory between those 2 and mine tows fine. I'm a little nose high but not enough to matter much really. I've put thousands of miles on it the last 2 years without issue.

Weigh your trailer axles when it is loaded and nose high. I suspect you will find the equalizes do not do much equalizing.

Deleted...I was wrong

atvanish wrote:
My head is spinning trying to understand two potentially debatable questions after my research. I pretty much gave up on getting a fifth wheel due to my truck height until I had to tow an old one this weekend and remembered how nice they tow. My truck is ~2-3" taller than a 'normal' 2500/3500 keep in mind...
1) How nose high is acceptable? My understanding is equalizer axles are designed to accommodate this...
2) Do any manufacturers allow/warranty GN adapters? Trailer I towed had one...
Constructive thought would be appreciated! :)

Options:
1) Lower the truck
2) "Flip" the axles, if not already done
3) Add a sub-frame spacer to raise the FW to the desired height. Don't forget that you also need to maintain at least 6" bed clearance besides the attitude of the FW.

Towing "slightly" nose high (like 2-4") shouldn't be much of an issue unless you tow near, or at, GVW a lot. I tow about 2-3" nose high because I want max clearance on my bed. I'm betting that, if I go to a newer truck, I'd be higher and would have to go the frame spacer route to raise my FW a couple inches.

Lyle

You may be able to get the axles flipped on a fiver. That will give you 4 to 6 inches more. I thought I might have to do it but it turned out not to be needed. The local trailer place (not RV shop) said they would do it for $150 to $200.

My 1st 5er to pull with my F250 4x4 was a Prowler that kissed bed rails more than once despite best efforts to avoid extreme unlevel situations. I tried raising the hitch and experienced unsatisfactory towing. Tried lowering pin box which required lowering hitch and then pin box would hit rails in sharp turn. I believe a goose conversion will make no difference. All told I never had any real trouble in 5 years I owned it. Traded it on a HitchHiker II figuring there would be no difference in clearance. To my suprise,there is more than 3 times as much clearance.
I suggest measuring rail height on level ground while hitched to a 5er near the pin weight you want to buy. Take your tape while shopping and measure ground to trailer (most dealers have trailer level while on display) and subtract rail height to see how much clearance will be.

atvanish wrote:
My head is spinning trying to understand two potentially debatable questions after my research. I pretty much gave up on getting a fifth wheel due to my truck height until I had to tow an old one this weekend and remembered how nice they tow. My truck is ~2-3" taller than a 'normal' 2500/3500 keep in mind...
1) How nose high is acceptable? My understanding is equalizer axles are designed to accommodate this...
2) Do any manufacturers allow/warranty GN adapters? Trailer I towed had one...
Constructive thought would be appreciated! :)

I had this with my trailer. There is a certain amount of equalizing of weight between the axles of the trailer. That said, I had my axles flipped on my trailer (leafs moved on top of axle instead of under). There was a kit for this and I recall it only costing me a couple of hundred total. Yes, the trailer rides higher, but that's not all bad. You get better ground clearance and don't have to bend over as much to get to things that are low on the trailer. If you do this I would recommend getting steps to accommodate the new height (my last step is a doozy). Some trailers have some adjustment built in. Mine didn't.