<PAGE>
Exhibit 20.6
Page 1 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of May 2000
Distribution Date of June 15, 2000
Servicer Certificate #13
<TABLE>
<S> <C>
Original Pool Amount $714,764,750.47
Beginning Pool Balance $502,327,257.81
Beginning Pool Factor 0.7027868
Principal and Interest Collections:
Principal Collected (Incl. Servicer Advance Repay) $17,177,019.90
Interest Collected $3,580,547.08
Additional Deposits:
Repurchase Amounts $0.00
Liquidation Proceeds / Recoveries $707,246.95
Total Additional Deposits $707,246.95
Repos / Chargeoffs $950,683.77
Aggregate Number of Notes Charged Off 159
Total Available Funds $21,274,783.17
Ending Pool Balance $484,389,584.90
Ending Pool Factor 0.6776909
Servicing Fee $418,606.05
Repayment of Servicer Advances $190,030.76
Reserve Account:
Beginning Balance (see Memo Item) $26,925,724.46
Target Percentage 5.25%
Target Balance $25,430,453.21
Minimum Balance $14,295,295.01
(Release) / Deposit ($1,495,271.25)
Ending Balance $25,430,453.21
Current Weighted Average APR: 8.496%
Current Weighted Average Remaining Term (months): 38.92
<CAPTION>
Delinquencies Dollars Notes
<S> <C> <C> <C>
Installments: 1 - 30 days $2,828,856.11 2,466
31 - 60 days $758,085.09 633
60+ days $221,478.72 130
Total: $3,808,419.92 2,470
Balances: 60+ days $5,225,660.08 130
Memo Item - Reserve Account
Prior Month $26,372,181.04
+ Invest. Income $108,103.46
+ Excess Serv. $445,439.96
+ Transfer (to) / from Collections Account $0.00
Beginning Balance $26,925,724.46
</TABLE>
<PAGE>
Exhibit 20.6
Page 2 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of May 2000
<TABLE>
<CAPTION>
NOTES
TOTAL CLASS A - 1 CLASS A - 2 CLASS A - 3 CLASS A - 4 CLASS B NOTES
<S> <C> <C> <C> <C> <C> <C>
$714,764,750.47 $147,000,000.00 $197,000,000.00 $200,000,000.00 $145,745,000.00 $25,019,750.47
Original Pool Amount
Distributions:
Distribution Percentages 0.00% 96.50% 0.00% 0.00% 3.50%
Coupon 5.0025% 5.5500% 5.9500% 6.1300% 6.2200%
Beginning Pool Balance $502,327,257.81
Ending Pool Balance $484,389,584.90
Collected Principal $16,986,989.14
Collected Interest $3,580,547.08
Charge - Offs $950,683.77
Liquidation Proceeds/Recoveries $707,246.95
Servicing $418,606.05
Cash Transfer from Reserve Account $0.00
Total Collections Available
for Debt Service $20,856,177.12
Beginning Balance $502,327,257.82 $0.00 $133,852,819.59 $200,000,000.00 $145,745,000.00 $22,729,438.23
Interest Due $2,473,064.25 $0.00 $619,069.29 $991,666.67 $744,514.04 $117,814.25
Interest Paid $2,473,064.25 $0.00 $619,069.29 $991,666.67 $744,514.04 $117,814.25
Principal Due $17,937,672.91 $0.00 $17,309,854.36 $0.00 $0.00 $627,818.55
Principal Paid $17,937,672.91 $0.00 $17,309,854.36 $0.00 $0.00 $627,818.55
Ending Balance $484,389,584.91 $0.00 $116,542,965.23 $200,000,000.00 $145,745,000.00 $22,101,619.68
Note / Certificate Pool Factor 0.0000 0.5916 1.0000 1.0000 0.8834
(Ending Balance / Original Pool Amount)
Total Distributions $20,410,737.16 $0.00 $17,928,923.65 $991,666.67 $744,514.04 $745,632.80
Interest Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Principal Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
Total Shortfall $0.00 $0.00 $0.00 $0.00 $0.00 $0.00
(required from Reserve)
Excess Servicing $445,439.96
(see Memo Item - Reserve Account)
Beginning Reserve Acct Balance $26,925,724.46
(Release) / Draw ($1,495,271.25)
Ending Reserve Acct Balance $25,430,453.21
</TABLE>
<PAGE>
Exhibit 20.6
Page 3 of 3
Navistar Financial 1999 - A Owner Trust
For the Month of May 2000
Trigger Events:
A) Loss Trigger
B) Delinquency Trigger
C) Noteholders Percent Trigger
<TABLE>
<CAPTION>
5 4 3 2 1
Jan-00 Feb-00 Mar-00 Apr-00 May-00
<S> <C> <C> <C> <C> <C>
Beginning Pool Balance $570,358,289.63 $555,232,338.87 $537,539,093.52 $517,062,538.52 $502,327,257.81
A) Loss Trigger:
Principal of Contracts
Charged Off $823,183.48 $2,395,560.90 1,246,287.60 $1,512,792.75 $950,683.77
Recoveries $1,281,147.20 $875,831.70 1,060,161.17 $1,430,422.22 $707,246.95
Total Charged Off (Months 5, 4, 3) $4,465,031.98
Total Recoveries (Months 3, 2, 1) $3,197,830.34
Net Loss / (Recoveries) for 3 Mos $1,267,201.64 (a)
Total Balance (Months 5, 4, 3) $1,663,129,722.02 (b)
Loss Ratio Annualized [(a/b) * (12)] 0.9143%
Trigger: Is Ratio > 1.5% No
Mar-00 Apr-00 May-00
B) Delinquency Trigger: $5,300,727.14 $5,939,864.93 $5,225,660.08
Balance delinquency 60+ days 0.98611% 1.14877% 1.04029%
As % of Beginning Pool Balance 1.06152% 1.04913% 1.05839%
Three Month Average
Trigger: Is Average > 2.0% No
C) Noteholders Percent Trigger: 3.55788%
Ending Reserve Account Balance
not less than 1% of Initial Aggregate
Receivables Balance
Trigger: Is Minimum < 1.0% No
</TABLE>
Navistar Financial Corporation
by: /s/ R. W. Cain
R. W. Cain
Vice President and Treasurer
